Chapter 2 - Research and Development

Hello, all. First, thanks for all the kind words on the first chapter! Hopefully you enjoy this chapter just as much (or more!). Izuku’s ready to start exploring the potential of doubles – in more ways than one! This chapter turned out longer than I’d initially guessed, but that’s mostly because I had a lot of fun writing it. I suppose this kind of length should be expected for chapters with more than one girl.

As stated in the first chapter – this story contains unrealistic penis sizes, excessive cum, and sex that is most definitely anatomically not possible because of said unrealistic sizes. Extra warnings included below.

As a clarification, this story will contain no Yaoi/Gay male action. Or any M/M/F action. Put more simply, there will be males involved in any of the lewd activities other than Izuku.

 Also, if you’re totally uninterested in plot of any sort, just ctrl-f “Sexy time” to skip ahead.

Chapter 2 –Research and Development
Pairing(s): Izuku/Tsuyu/Momo
Extra warnings: Some female on female content in this one 
============================================================

             Izuku could honestly say that this was the best morning he’d ever had in the dorms. Even better than the day after he’d smashed Shigaraki’s head into the pavement. That morning he’d awoken with pains all over his body, but this time he woke up with Momo all over his body. Which was way better.

             They must have rolled around during the night as she was splayed out over his torso, head tucked into his neck as she tickled it with gentle breaths. She wrapped around his left side, a shapely leg locking both of his penises against his torso. Apparently spent from the night before, they remained flaccid even with her softness in constant contact with his body. Her left arm lay across his chest, covered by the waterfall of ebony hair she’d let out before falling asleep, while the other hand was tangled in his curls. His right hand was holding her left, still clasped together even in sleep, while his left was comfortably secured between her breasts.

             She stirred mere moments after he awoke, slowly coming to consciousness with a cute yawn. Propping herself up on her right arm, she smiled beautifully at him.

             “Hey.” The simple agreement sent heat through his body and he returned her smile somewhat bashfully.

             “Good morning.” The clock on her bedside table read 10am, so the greeting still worked. “Sleep well?”

             “Wonderfully.” Then she laid back down, as content with their current position as he was. The only thing they exchanged for the next few minutes were chaste kisses, words not needed. It was so nice and peaceful, so shockingly domestic in a life that was usually filled with adventure and excitement, that Izuku could almost burst from the warmth filled his stomach.

             “So.” He did feel they should address the elephant in the room. While they were tangled up like lovers, last night had been the only form of romance they’d shared, and he wanted to be clear on what they were. “Think I could wake up here more often?”

             “Mhm. Definitely.” The casual acceptance of their relationship brought with it a kind of warm affection Izuku had been missing ever since he and Ochako had split. As close as he was with all his classmates, friendships and relationships were different things.

             “Now, as much as I love the cuddling, I do need to get cleaned up. Do you mind waiting here until the coast is clear? I’ll be back before you know it.” Izuku understood that. Keeping their romance low-key and out of the public eye was his preference as well. They were about to be pro-heroes after all.

             “Yeah, of course. Take your time!”

             When Momo did return, still clad in only a towel, Izuku was in the middle of putting on the clothes he’d worn the previous night. He stopped at the expression on her face because she looked very, very serious. Like she did before a big exam, or before a fight. Which didn’t bode well. Thankfully she didn’t seem angry, at least not at him, but it was concerning.

             “We need to talk.” Nothing good ever came from that statement.

             “Um? Did something happen?” Izuku really hoped their relationship wasn’t about to crumble before twenty-four hours had passed.

             “You weren’t lying yesterday when you said your penises had nothing to do with a quirk, right?”

             “Um, I mean I didn’t think I was. I’m pretty sure we established they do have associated quirks last night though.”

             “Well, apparently everything those are actually just minor quirk manifestations. Side effects to a more serious one.”

             “Are you hurt?” Izuku nearly flew into full panic mode. “I’m so sorry! We should have stopped as soon as we realized there was something abnormal going on! Oh no!”

             Momo’s face shifted, big eyes widening as she connected the dots of Izuku’s assumption. Apology was clear in her tone. “Oh no! No, I’m not hurt! I’m sorry, I was just thinking. Sorry for scaring you. No, actually, I think it’s a good thing?”

             That it was a question confused Izuku, but he let Momo continue. At least it seemed like whatever had happened wasn’t negative. He did his best to calm down.

             “Well, here. It’ll be easier if I show you.” Momo dropped the towel to the floor.

             He’d expected visible change or, even worse, an injury. Maybe, his mind supplied, his cum had some strange properties that had done something? He studied every inch of her nude form, for once ignoring all the enticing curves as he tried to figure out what was wrong. No matter how he looked at it though, he couldn’t see anything different. Maybe it wasn’t physical at all? His eyes returned to her face to find her smiling at him.

             “Not my body. Sorry, it was fun watching you try to figure it out.” She clarified. “It’s my quirk.”

             With that, her body glowed like it did when made use of her quirk, a wonderful smell filling the room. Which wasn’t normal: her quirk didn’t have an associated scent. Wait. He could see the faintest whisps of something surrounding her form…his eyes widened. That meant…

             “I see you figured it out. Yes. It appears that my quirk has somehow mutated. Or perhaps more accurately, been enhanced.”

             That should have been impossible. But he couldn’t deny what he was looking at. And smelling. Momo’s creations had to be solid. That was a simple fact. Sure, she could make solids that contained gasses or liquids, like the spray cans and smoke grenades she often used, but the actual object had to be solid. But he’d just watch her produce what must have been perfume directly from her skin.

             “But that’s…”

             “Completely impossible. And yet, the girl’s bathroom smells like every wall’s been doused in perfume. When I thought about making the bottle like I usually do the perfume itself just came out.”

             “Can you still make the bottle?”

             “Yes.” She demonstrated it for him. “I tested other things as well, briefly, but as far as I can tell my quirk operates entirely as normal, except that I can now make liquids and gasses directly.”

             Izuku collapsed, sitting on the mattress. “And you think it’s because of the sex?”

             “It’s the only thing that changed between yesterday and today. There’s no other explanation, as hard as it is to believe. You do realize what this means, don’t you?”

             “That apparently my cum boosts someone’s quirk? Or is it just having sex with them? I suppose it could be either.” He managed to cut off the oncoming rant. He’d been working on not spewing out as much quirk information for the last three years and patted himself on the back for succeeding. He picked up anew.

            “It’s all a bit much.” That was putting it lightly. Of course, his first time couldn’t just be nice and simple. Nothing ever was when it came to him and quirks.

             “Well, yes. But I was more referring to the fact that we’re going to need to do more research before drawing any conclusions.” Still nude, Momo walked to her desk and with a gesture produced a large whiteboard, markers popping into her hand. “Hmm. Interesting. It’s also much easier and faster to produce large objects.” She then wrote a series of questions on the board.
[ol]
[li]Is Izuku’s quirk the source of the enhancement? This one had a yes? beside it.[/li]

[li]How long does the enhancement last?[/li]

[li]How long between sex and enhancement appearing?[/li]

[li]Is vaginal sex needed or does oral suffice? Anal?[/li]

[li]Is there any difference when the left penis is used?[/li]

[/ol]

            The list stopped there. This was good. This was comfort and familiarity for Izuku. And for Momo too, he’d guess. Sure, having Momo naked and him shirtless was different than all the other times they’d sat in this very room, taking notes and spit balling theories back and forth. But he couldn’t help but find comfort in the activity. Being told that having sex could impact the other person’s quirk was an earth-shattering revelation and he forced himself to focus on that whiteboard, to ground himself in what had become a frequent exercise between the two of them.

            When Momo had learned of his penchant for quirk analysis, she’d asked if he could look over the strategies she liked to develop in her spare time. He’d agreed, jumping at the chance to spend more time talking about quirks and their possible uses. Katsuki, his usual training partner, wasn’t exactly receptive to such conversations. The blonde preferred to focus on fighting rather than thinking. So, he’d found himself in Momo’s room, discussing possible synergies and strategies that their classmates could make use of. The meeting had easily extended from a planned hour-long conversation, time falling away as they went through different and varied quirk combinations. It had been that first meeting between Momo and him that formed the foundation of their friendship.

            Since their initial discussion at the end of their first year there hadn’t been a week hadn’t without a similar sort of talk. It wasn’t always the two of them alone either. Classmates who were stressed about exams or the like often joined them. It was through those meetings that he’d gotten to know Momo as a friend, not just as a classmate. Looking back on it now, maybe last night made a bit more sense than he’d initially thought. The whole relationship they now shared made quite a bit of sense; their classmates did like to joke that quirk discussions weren’t the only things happening in Momo’s room. Which wasn’t true. At least, it wasn’t until yesterday.

             But that brought Izuku back to the whiteboard. Focus on the quirk. That was easy enough. They’d analyzed plenty of unknown quirks from competing hero academies and villains in the past. The initial list Momo had written were good questions. He added one more himself: Enhancement’s effects on other quirk types. Mutation? Transformation?

            “What about accumulation?” Momo asked, noting the missing element.

            “The only accumulation quirk I know of besides my own is Rewind and that’s all I ever want to think about that.” Momo instantly caught on, disgust crossing her face as she stopped herself from adding it to the list.

            “So. Where do we start?” She walked to her closet to get changed, rummaging through it to find some clothes.

            “Well, I mean the easiest and maybe most important is number two. You’ll just have to try and make gasses every hour to figure that out. That should get us a ballpark until we get the answer to three.”

            “Good. I’ll make sure to do that. Once it disappears, we can just have sex again to get the answer to one and three. Although…” she trailed off, apparently lost in thought. He jotted down the plan for each question. “I think we can answer all the other questions most easily if you just have sex with someone else.”

            Hold on, what? His face must have given away his surprise because Momo rolled her eyes at him.

            “Oh, come now. You must be aware that this discovery is quite revolutionary and will require experimentation. You didn’t honestly think we’d just keep it between the two of us, did you? Besides, it’s not like I mind.”

            “Eh?” Izuku’s brain broke. By the time it rebooted Momo was fully dressed, this time in a simple off-shoulder shirt paired with high-waisted jeans. He came to as she was pulling her hair into its usual form, a slight smirk on her face. “Sorry. Could you repeat that?”

            “I said I’m fine with it. If you check with me about it all, I have no issue with you having sex with others. I mean, you have two penises Izuku. It’d be a shame not to use them. And before you ask, no, I’m not going to take them both at once.”

            “Eh, uh, um, ok?” Izuku didn’t really see any alternative than agreeing. She was right, as always. He had a quirk that potentially boosted the quirks of others and it was important that they figure out exactly what that meant. Plus, any guy would be at least somewhat excited by the possibility of having more sex. Especially if his beautiful sort-of girlfriend was in on it. “What…what does that make us?”

            “Why don’t we not worry about labels for now? If it really matters, I guess we’re in an open relationship?” Momo paused to make the bed. “Since you seem somewhat concerned by this, why don’t you let me take care of it?”

            “What do you mean?”

            “I’ll take care of finding someone else for you to have sex with. I admit, I’m a bit excited by the prospect. I’ve always wanted to try having a threesome after Mina told me how much fun it can be. You’re practically built for them anyways.” She mused, visibly more interested in the idea. “Alright! Here’s what’s going to happen. I’m going to go out and find someone to join us, figure out how long the boost lasts, and then once it wears off I’ll text you, you come here, and we have ourselves another fun night.”

            “Um.” This was all moving fast. Then again, whenever Momo got excited things tended to come together quickly. Best to just go along with it. A threesome sounded like another dream come true, and if she was the one organizing it then who was he to refuse? He did have some concerns “Are you sure? What if it wears off tonight?”

            She blushed at that. “Thanks for looking out for me. Yes, we’ll have to wait until at least tomorrow.”

            They both laughed at that, the limp in Momo’s step quite noticeable when she’d entered the room. It was a mark of pride for him, having fucked her so good she was having trouble walking, but going at it again tonight really shouldn’t be on the cards.

            “Happy to help. Well, I think I’ll go buy a lottery ticket since apparently all my dreams are coming true today.” He bade her goodbye with a smile, still in shock from the conversation they’d just had. A relationship with Momo really was something else, he decided. In the best way, of course.
++++++++++++++++++++++++++++++++++++

            “So? How long did it end up lasting? Or is it still active?” Izuku was back in Momo’s room. They both agreed that even if they weren’t going to have sex, they wanted the cuddles. Sneaking in had been a bit of an operation, constant texts flying back and forth as Momo did her best to surreptitiously check if the coast was clear. In the end Izuku had just jumped out of his window and climbed in through hers. A bit extreme, but far less likely to get them caught.

            Izuku was on his back once again, this time with an arm wrapped around Momo, pulling her against him. She rested halfway on his chest, arm thrown over it and head flat against his pectoral. One of her legs was between his, chest pressed into his side as she looked up at him. Thankfully she was wearing a loose shirt because he didn’t think he’d be able to stay flaccid otherwise. Even if his penises were safely tucked into his boxers.

            “It wore off after dinner, so around eighteen hours if we assume it started the moment you came in me.”  That seemed like the most likely trigger for the quirk, Izuku thought. His intuition was telling him that he needed penetration to trigger it, but he wasn’t one hundred percent sure. Momo had agreed that that made the most sense as well.

            “Alright, well that makes it easier to hide for now.”

            “Yeah,” she idly circled his nipple with one hand. “I was worried I’d accidentally make another cloud of perfume when Bakugo and Kirishima came back from their workout. Can’t they use the gym showers?”

            Izuku chuckled at that. The two had a bad habit of getting into friendly arguments during their workouts, often resulting in them forgetting to shower until they got back to the dorms. He’d never have thought it would work out between the two of them with the amount they fought, but Kirishima had proudly proclaimed that “manly arguing makes for the best sex.” Which was more than he ever wanted to know, but hey, if it worked for them who was he to judge. He, and the rest of U.A., were just glad Kacchan had found someone. It meant there was at least one person who could exert some form of control over the literal loose cannon.

            “Yeah, they do tend to stink up the whole place, don’t they? So? Still committed to tomorrow? Find someone?” Izuku tried to keep his voice level.

            “Oh, is someone a bit excited? What happened to the second guessing?”

            “It’s a hero’s duty to investigate and control unknown, possibly dangerous quirks. And when 3-A’s most brilliant strategist suggests that this is the best way to do that…who am I to disagree?”

            “Ah, soon-to-be pro hero Deku adding another heroic action to his record. I’m sure society will thank you for your sacrifice!” Izuku liked it when Momo let herself go a little bit. She was a great tease when she wanted to be.

            They both collapsed in laughter at the ridiculousness of the situation, although Izuku could clearly see excitement in her features, certain that his eyes reflected the same.

            “So. Who is it?” He couldn’t keep the curiosity out of his voice.

            “You’ll have to wait until tomorrow to find out. It’ll be a nice surprise for you, I’m sure. I will say I’m quite excited.” She kissed him again, Izuku losing himself to the feel of her mouth. “Now go to sleep. I’m tired and we both need our energy for tomorrow.”
+++++++++++++++++++SEXY TIME STARTS+++++++++++++++++++

            Izuku paused, hand raised as he prepared to knock on Momo’s door, thinking about the night to come. He still didn’t know who was waiting on the other side of the door. All Momo’s text had said was to “Come to my room. We’re waiting for you.” She’d been tight lipped for the whole day, and it wasn’t as though Izuku could just walk up to every girl in his class and ask them “hey are you the third person in the threesome Momo and I are going to have?” For all he knew it wasn’t even someone in his class!

            He took a deep breath, rapping knuckles against the wood of the door. In the middle of his exhale he heard Momo invite him in. He opened the door carefully, taking in the room as he did so. Momo was sitting behind her desk, in profile from the door and facing the couch. He’d probably interrupted a conversation between Momo and the third member of the evening…who was…Tsu?

            “Hello Izuku.” Tsuyu croaked from the couch.

            “Uh, hey Tsu. How’s it going?” He made sure to shut the door behind him, walking over to take a seat on the bed. That way he could face Momo and Tsuyu at the same time. Tsuyu looked completely at ease, hunched over in her usual sitting position. She was, as usual, dressed simply. With her torso swaddled in a thick, green sweater, and legs covered by a long skirt and thermal underwear you’d be forgiven for thinking it was the middle of winter. Sometimes he forgot that she was cold blooded, but such warm clothing even in March helped to remind him.

            “Not too bad. Happy to be done with school. So, are your dicks really as big as Momo said?” He should have expected it. Tsuyu had a habit of getting straight to the point.

            “They are!” Momo nodded emphatically from between them.

            Izuku nodded, confirming Momo’s claims. “Are you…uh…also interested in them?”

            “Mostly curious. I’m not a size queen like Yaomomo.” Once again, blunt. It did cause Momo to blush. “Mostly about the quirk part. She was just explaining that.”

            “And, uh, you’re okay with all of this?” While Tsuyu hadn’t been the last person he’d guessed, she wasn’t exactly high on the list. It wasn’t that she was a prude or anything, but she’d never expressed any particular interest in sex, outside of admitting that she enjoyed it.

            “I wouldn’t be here if I wasn’t. I’m curious about the boost piece, Yaomomo said you needed help, and you’re both attractive. Trying new things is good.” Her logic was, as tended to be the case, simple and sound.

            “And Ochako’s okay with it?” He was pretty sure that they had a somewhat similar relationship to him and Momo, but he did want to check. All he was certain of was that they had sex. Rather frequently, according to Mina’s complaints about the noise her neighbor made.

            “We’re friends with benefits. Didn’t she explain that? She offered to have sex with you in the past.”

            “Yeah, well, that was when I was a bit more embarrassed by…” Izuku gestured down to his pants. He’d also been a bit confused about his and Ochako’s relationship at the time. They’d split because she’d come out of the closet regarding her bisexuality, both agreeing that it would be best to separate and give her some time to breathe and come to terms with things. Then she’d come back a few months later asking if he wanted to have casual sex.

             “I haven’t tried it with a guy, and, well I’d like you to be my first?” Had been the offer. He’d been honored but still refused. Both out of embarrassment and because he wasn’t sure he could do that and not “catch feelings” as Mina liked to say. The whole affair had been a bit of an embarrassment and he couldn’t remember much else from the conversation. It could very well be that she had explained the situation with Tsuyu.

            Of course, they were well over that by this point, time having healed all wounds, but she’d never explicitly offered again. As far as he knew, though, she still hadn’t actually hooked up with a guy. But that wasn’t what he should be thinking about right now.

            “That makes sense.”

            “Right!” Momo clapped her hands. Izuku could swear he saw her eyes light up. “Now that we’re all on the same page, should we get started?” She didn’t wait for a response. “Izuku. Take off your pants.”

            “Yes. Let me see them.” Tsuyu’s pitch didn’t even change, although she did turn slightly to look directly at him. Izuku hastened to comply, pants and underwear once again hitting the ground only moments after entering Momo’s room.

            Momo pulled her chair up to side of the bed, moving as if to examine them like she had the night before. Tsuyu just hopped out from her seating position to sit next to him on the bed.

            “Yaomomo wasn’t kidding.” While her voice betrayed nothing, he could see Tsuyu’s eyes widening as he at her. That attention was quickly diverted to his own lap when he felt Momo’s hand grasp his left shaft. Her hand was much warmer than their first night together, but that didn’t stop his body from responding with shock. She also didn’t hesitate like the last time, hand immediately starting to stroke him. His eyes met hers, a soft groan leaving him as he felt blood rush downwards. This time he wasn’t fighting off the after-effects of a night of drinking, though, lightheadedness absent from her ministrations.

            “Fuuuck” His gasp was much more audible when Tsuyu’s hand grasped his right shaft. While there’d been times that Momo had held both at once, there was something about the feeling of two different hands on his cocks. He could easily liken it to the difference between masturbation and a handjob: even if the actions were physically the same, having another person perform it simply heightened the pleasure he felt. And this took that to another level.

            Even though the size difference between Momo and Tsuyu was frankly enormous, the black-haired girl having close to half a foot on the greenette, Tsuyu’s hand was actually bigger. By a good margin. It was one of the consequences of her having a frog-based quirk and he couldn’t be more appreciative of it than he was now. He also really appreciated her ability to secrete mucus. Because she’d coated her hand in a thin layer of it, the natural lubricant easily spreading over his shaft as she picked up speed.

            “My hands are sticky. Lube should help.” She answered his unasked question when he looked to her face. “Trade?” the question was addressed to Momo, who acquiesced instantly. And suddenly both cocks were lubricated, the two girls reaching across his lap to access the other’s previous plaything.

            He was hard in record time, both shafts pulsating with the blood flowing through them. Tsuyu’s hand just barely failed to encircle his entire left shaft. She’d tried her best too, Izuku watching as she stretched her fingers around every inch of the organ in an attempt to find some section where her forefinger and thumb could touch. There wasn’t one. Even if his left shaft was less girthy than the right, it was still wide enough to force them apart at all points. And more than long enough that her two hands failed to enclose it.

            “Yaomomo. You’re sure this will fit?” She looked at the shaft with some trepidation. Her hands didn’t stop wringing it though.

            “The right one went all the way in me.” Momo held the object in question up to Tsuyu’s wide eyes. “I can’t be sure about the left since I didn’t try.”

            “I suppose I’ll stick to the right then.” Tsuyu’s hands left his left shaft. It slapped heavily against his thigh before Momo reached over to pick it up again. Tsuyu gripped his right with one hand, turning it this way and that as she seemed to measure it with her eyes. Then she just let out a shrug, scooted slightly away from Izuku, and bent at the waist. Her face hovered just over his cock for a moment before she opened her mouth and stuck the tip inside.

            Even Momo seemed surprised by the quick action, Izuku catching her wide eyes as her hands froze around his other shaft. She wasn’t inactive for long, though. Her knees hit the floor seconds after Tsuyu’s first taste, Momo tucking a bang behind her ear as she gave the tip of his left shaft a little kiss. And then her lips opened up and Izuku, once again, entered the promised land.

            Reflecting on it later, Izuku would realize that this was the first time he was truly experiencing something that only he could. Sure, Momo had grabbed his other shaft while they were having sex the last time. But it had been gentle, more of a guiding hand than anything else. This time he actually got two blowjobs at once. Which, as far as he knew, no one else in human history had ever experienced.

            But he wasn’t thinking about any of that in the moment. He simply got lost in the sensations. While both of his shafts happily enjoyed the mouths that surrounded their ends, the two blowjobs were far from similar. Tsuyu’s wide mouth mean that his shaft wasn’t completely enveloped by her lips, instead the sides were brushed by the warm breath coming out of her mouth as she sucked, only the top and bottom in direct contact with her thin lips. Momo, on the other hand, had much plumper lips, his shaft constantly being brushed by the cherry colored border of her mouth.

            Momo also used her hands more than Tsuyu did. Her palms were constantly gliding up and down in varied patterns, making great use of the lubricant left behind by Tsuyu’s earlier ministrations. At first, they moved slowly in a simple up and down motion, gliding up as Momo’s mouth did and down in sync once again. As Momo became more absorbed in the blowjob, the motions became more complicated. Up and down together became up and down separately, her right hand starting just under her lips while the left rested at the base. Then the right went down while the left went up, both hands meeting in the middle as Momo buried as much shaft in her mouth as possible.

            He lost track of Momo’s hands moments later when something wrapped around the tip of his right shaft. His gaze immediately moved to Tsuyu, just in time to catch the pink flesh of her tongue winding its way down his cock. The girl looked concentrated, mouth no longer moving as the slimy organ worked its way gradually down the whole shaft in a tight spiral. She moved her hands out of the way to allow it to reach the base. It was if his entire shaft was being squeezed by a warm, soft, wet boa constrictor. Once again, he found himself praising the heaven’s for Tsuyu’s quirk.

            And then the tentacle was retracting, twisting up his cock as his entire length was lavished with Tsuyu’s saliva. The whole motion was strange, the organ twisting up and into Tsuyu’s mouth in much the same way that a screw would exit wood. At no point did the constriction let up, rather it was if every inch of his shaft was being licked all at once. Which he was. Just in reverse. Every inch of his cock was lapped at by her long tongue, comfortable friction driving unknown sensations of pleasures from the tip of his shaft all the way to his brain. Even Momo stopped her motions to watch it, head popping off his shaft.

            “Too tight?” Izuku shook his head “no” at the question from Tsuyu.

            “Fuck. No. That was incredible.” His voice was barely more than a moan, both shafts already craving the attention they’d just lost.

            “I didn’t know you could do that with your tongue Tsu.” This comment came from Momo.

            “I wasn’t sure I could. But I practiced being gentler for rescue, and, well,” she blushed here, which was rare. “Ochako really likes what I can do so I thought I’d try it.”

            Izuku had no trouble believing that last statement, the widening ‘o’ of Momo’s mouth suggesting that she didn’t either. That was the end of the conversation, Momo turning her attention back to what was still held in her hands. Tsuyu did much the same, although this time she just opened her mouth and let her tongue shoot out instead of wrapping her lips around the tip. And in no time at all, Izuku was on the receiving end of a most unique oral experience.

            The beginning of the blowjobs had been unique. Now, though, he wasn’t certain he could even call them the same activity. While Tsuyu’s tongue did provide a sort of sucking sensation, it wasn’t really all that comparable to Momo’s conventional oral ministrations. He actually wasn’t sure what to compare it to. All he knew was that it felt good. Like really good. Like so good he definitely wasn’t going to last much longer with one shaft in Momo’s mouth and the other one being licked in its entirety. Tsuyu’s ability to change the speed and amount of tongue moving along it certainly didn’t help, and neither did the speed at which Momo started moving.

            The sounds alone almost brought him over the edge. Momo’s blowjob was just as sloppy and desperate as the first time she’d taken him into her mouth, saliva slipping out in rivulets that ran along his dick and over her clasped knuckles. The gulping noises as she swallowed and sucked along his length were complemented by the occasional pop as the underside of his glans escaped her lips and the noises of pleasure coming from deep in her throat. Tsuyu was far quieter, but the drawn-out slurping sounds she made were similarly arousing. It was if she was sucking down a strand of particularly long spaghetti, except in this case that strand was the shaft of his dick.

             Izuku forced himself to endure, though. Who knew when he’d ever experience something like this again? His hands went behind him, Izuku leaning his weight against them as he tilted his head to the ceiling. His breaths came out deep and fast, released directly upwards. Frankly, he didn’t think he’d be able to last much longer at the sight of the two girls in addition to the sounds and sensations they were giving him. So, he did his best to avoid that.

             Even with that precaution taken, he was eventually brought up and over the edge of pleasure. He could feel his testes churning with unreleased semen, his shafts swelling slightly to accept the no-doubt monstrous amount that was about to be pumped through them.

             “I’m about to cum!” He shouted out the warning once again. This time, though, it was heeded instantly. Tsuyu’s tongue retracted with a snap into the back of her mouth, and Momo pulled off as well.

             While Tsuyu’s tongue stayed in her mouth, Momo’s head did not stay off his cock. She moved over slightly, frantically shifting and then engulfing the shaft that had previously been Tsuyu’s property in her mouth. Izuku knew better than to warn her again, having experienced that futility not two days ago. So, he just let her do her thing.

             He was still caught off guard the moment his balls contracted and semen started flowing, because Momo still didn’t remove her head. Sure, she stopped moving, but she didn’t lift off. He lost track after that, the wave of pleasure completely shutting down his senses. His left shaft blasted into open air, laying along his thigh like a cannon. The shots rained down on Momo’s carpeted floor, Tsuyu watching with interest as it pulsed over and over again, outputting the volume of semen Izuku was coming to expect. Not that he actually saw what was happening. His head was once again tilted upwards, looking away from his cocks as he let out deep breaths of satisfaction.

             When he did come back to post-nut clarity, it was to extremely arousing sight of Momo’s throat contracting, lips still wrapped around him as she tried to swallow the no-doubt considerable volume of semen. She wasn’t all that successful. Thick rivers of white liquid poured out from under her sealed lips to pool in his crotch and on his legs while she did her best to absorb the what she could. Unfortunately, it was just too thick and voluminous. Her head rose with a pop, little streaks of semen still running out of mouth as she looked up at him.

             “Wow. I didn’t expect you to swallow.” Tsuyu was the first to speak.

             “I wouldn’t normally. It was for research. Wanted to check if my quirk gets boosted by swallowing his semen or if it needs to be vaginal.” Momo once again made use of her quirk, a spray bottle and numerous towels spawning into existence around her. She got to work right away, spritzing away the semen that had hit the floor while Izuku grabbed a few towels to wipe himself off. Tsuyu even took one to help, which was considerate.

             “Feel any different?” He asked.

             “Not yet. I tried to make water directly but couldn’t, so it hasn’t taken effect yet. I’m not even sure if it will. For some reason I suspect that vaginal will be necessary.”

             Tsuyu’s flat, sarcastic “oh no” brought a smile to all their faces.

             “To the bed?” Momo’s question was answered by a nod from Tsuyu. Well, Tsuyu was already on the bed, but Izuku figured that wasn’t really the purpose of the question. At Momo’s gesture, he scooted up the mattress to sit against the headboard, giving him full vision of the rest of the room. Which was awesome because that meant he got to see both girls getting naked.

             While he’d seen Momo get undressed more than once, he doubted that even if he watched her do it every night it would ever fail to arouse him. As usual she started with her top, this time wearing a loose, long tunic. Which wasn’t all that loose on her, but hey, he wasn’t complaining. It slipped over her head with ease, the wide hem exposing the black bra she wore under it to his hungry eyes as she lifted it up. She kept the bra on for a bit longer, favoring him with a smile as she unbuttoned her jeans. They too came off easily, revealing bare legs and a bare pussy. Her panties must have found themselves in the same pile as her jeans, but Izuku didn’t really check. He was more fascinated by her delicate folds. And her tits. And her ass. Fuck. Momo was really hot.

             His gaze shifted to Tsuyu as Momo moved to join him on the mattress, feeling a bit bad about sort of ignoring her while Momo got changed. He hoped she didn’t blame him for it. However, it turned out that his mesmerized state hadn’t cost him at all. The the extra layers Tsuyu wore in the colder months meant she’d only managed to take off her outermost sweater and an extra one from under it by the time his vision shifted to her.

             Now she was in only a tight t-shirt and the skirt-and-leggings he’d first noticed. It was sometimes easy to forget just how curvy Tsuyu really was, but the skintight shirt did an excellent job of reminding him. While her breasts were nowhere near the size of Momo’s, they still looked more than sizable on her small frame. And, apparently, they were quite perky because he could easily see the nipples poking out in the t-shirt. Sure, he wouldn’t be able to see them from behind like his girlfriend’s, but they were certainly noticeable.

             This was easily confirmed when Tsuyu removed and discarded the shirt that hid them from his view. They were probably a bit less than a handful, but Tsuyu’s ridiculously small waist and narrow shoulders made them seem like more. They were a perfect fit for a girl of her frame, and the grin she gave him meant that she knew it too.

             The real highlight of Tsuyu’s curves, however, was her lower half. While her waist was incredibly tiny, her hips were the exact opposite. Izuku would readily admit that that old adjective “thicc” was pretty much made for girls like Tsuyu. If he had to hazard a guess, that was the reason why she owned so many button skirts. With her hip-to-waist ratio it was probably a nightmare to put on anything with a tight waist. At the very least, the buttons helped her out here, skirt dropping easily as she split it open from the front to reveal her legs.

              Tsuyu turned slightly to the side, clearly aware of the effect her limbs and ass had on the audience. Looking over, he could see that Momo was just as transfixed. He’d once heard Tsuyu explain to Mina that her quirk enhanced her jumping ability by boosting the muscles that drove that motion. Which explained what Izuku saw. Because her ass was magnificent. It bordered just below what would have looked obscene on someone of her size, somehow complementing her narrow torso even if each cheek was bigger than her head. The wonderful roundness was revealed inch by inch as she peeled her leggings down her legs, casually bending at the waist and thrusting the object of their attentions even further into space. Her thighs were no less impressive, muscles well-toned and defined against pale skin.

             It was only when she turned to walk towards them that he noticed she wasn’t even wearing panties. She caught his questioning stare.

             “It’s more comfortable this way. They get stuck a lot.” She and Momo shared a nod of commiseration.

             In no time at all he was surrounded on both sides by the two women, Momo’s hands tugging his shirt off as Tsuyu gave him a kiss. Like her blowjob, kissing her was a different experience due to her wide lips and long tongue, but he enjoyed it. The way her tongue danced around in his mouth enhanced the sensation, poking and prodding around his own organ. The moment he separated from Tsuyu, his lips were claimed by Momo, who was just as insistent with her tongue. The entire process left him gasping for breath, pleasure running through him as he gazed over both of their forms.

             “Do you mind if I ride him first? I want to be in control.” Tsuyu asked Momo, question passing over him as if he wasn’t even there.

             “Of course. Take your time. Would you like any help?” Momo sounded as eager to assist as she was whenever a classmate asked for help with an exam.

             “That would be nice. Let me get settled first.” Tsuyu stood up on the mattress, stepping over his torso to straddle him. Walking down to hover above his pelvis, she very deliberately met his eyes before stepping her left leg over to the right side of his body, right leg swapping places with it as she spun around. Now, instead of looking her in the eyes, Izuku was faced directly with her ass. She did turn around to look at him once more, bending slightly at the knees as she reached down to grab his right cock.

             “You think this one boosts?”

             “Yeah, that’s Momo’s current hypothesis.”

             “Well, let’s see what happens. I’m curious about it.” Then Tsuyu went quiet. He couldn’t see her expression anymore, but he imagined she probably looked about as concentrated as Momo had when he’d first entered her. Momo moved as well, walking to straddle his calves. She went down to her knees right away, resting comfortably on his legs and wrapping her hand around his dick as well. Tsuyu’s hand left him at that, the short girl likely more focused on the impalement to come. Momo tilted slightly, looking at him from around Tsuyu’s torso.

             Let her move herself. Don’t do anything until she says so. She mouthed to him. He nodded in agreement. Looking at Tsuyu hovering over him, he could really appreciate just how small she was. It must have been a bit scary taking a cock nearly as long as her torso. That didn’t seem to stop Tsuyu though, as she descended with purpose towards the tree that was his shaft. When he’d seen reverse cowgirl executed in porn, the woman tended to rest on her knees as she rose and fell, but with his size that simply wasn’t possible. Which meant Tsuyu had to stay on her feet, knees spread and bending as she lowered herself down. That had the side-effect of shoving her ass out towards him, the two globes filling his vision as her glutes flexed in a squat. Which was good. And bad. Good because, well, Tsuyu had a fucking incredible ass and he loved a good ass, and bad because he had to resist touching it.

             He wanted Tsuyu to focus entirely on her descent, not to be distracted by him playing with her rear.

             A good portion of his concern went away when her pussy touched his tip, though. The amount of liquid and moisture he could feel at her entrance at least told him that she was excited about what was to come. He let out a sigh of relief at that, having no other way to confirm her emotions since he couldn’t look at her face from this vantage point. With that out of the way he allowed himself to get lost in Tsuyu’s progress towards his thighs.

             As with Momo, the going was slow. Thankfully he wasn’t in charge this time: it had been stressful enough worrying about how much Momo could or couldn’t take for their first time. Now he could literally just sit back and relax as Tsuyu figured it out for herself. Sit back, relax, and admire her ass.

            That wasn’t to say progress wasn’t being made. He could see his tip spearing into her, Tsuyu’s outer lips even tighter than Momo’s had been when they’d first wrapped around his cock. Not shocking, especially since Tsuyu hadn’t orgasmed yet. Which was actually a good point. He slowly lifted a hand, trying to get Momo’s attention without showing Tsuyu anything. Thankfully she was paying attention, her face coming into view once again.

             Can you make her cum? He mouthed to her. He felt a bit bad for the lewd gesture he accompanied the request with, but it got the point across. Momo’s eyebrows rose as she registered the question. A smile quirked its way onto her face as she opened her mouth to respond. Good idea. I’ll see what I can do made it back to him, Izuku giving a thumbs up before returning his attention to the wonderful tightness now crawling its way down the head of his right dick.

            Tsuyu’s own head was tilted slightly back, her long hair cascading downwards with her bow resting just above the orbs of her rear. He could hear the panting sounds coming from above him even if he couldn’t see her open mouth. She was moved faster than he had the first time he’d penetrated Momo, likely far more confident in her own limits than he had been with Momo’s. She’d already enveloped the head of his cock completely, now working her way down the shaft, thighs straining as they drew closer to parallel with the mattress. Momo didn’t seem to be doing anything yet, but he trusted her judgement.

            The next few inches entered peacefully. Tsuyu was much quieter than Momo, tiny gasps escaping her lips as she moved downwards as opposed to the throatier moans the creation user let out. Still, he could tell she was at least enjoying the sensation of being speared; the number of those little noises coming out of her, as well as the wetness leaking out of her opened pussy told him that much. He could see her lower lips straining around his cock, their folds bent apart to make room for the log of meat he was feeding into her as juices flowed out of her. She stopped there for a moment, letting out a deep breath that sounded almost like a croak.

            “Do you mind if I lean on you?” She must have been asking Momo. He couldn’t exactly do much to support her from this angle. He didn’t catch Momo’s response, but it must have been affirmative because Tsuyu’s torso fell even further out of his view, hidden by the roundness of her ass.

            “How are you feeling?” That he did hear.

            “Good. You were right. He’s already bigger than anything I’ve put in me. But it doesn’t hurt. It’s just…I guess it all feels tight? And good. Very good.”

            “It was the same for me. Would you mind if I…” Momo must have demonstrated her intentions because she didn’t actually follow up with words.

            “Please.” Ah. She must have been demonstrating the what he’d gestured from behind.

            He watched as Momo’s hand, the one not holding his base steady, walk its way up his shaft. It gently gripped him just under the joining point between Tsuyu and himself, spinning around a bit before rising further up. He could just about make out the edges of her palm from around his girth, but it wasn’t his cock that the hand was worried about. Instead, it was Tsuyu’s clit that was her target. The moan that escaped Tsuyu confirmed acquisition; the renewed enthusiasm with which Tsuyu started moving down his shaft further confirmed it.

            While he couldn’t see Momo’s fingers, he could see the speed at which her palm was moving up and down. It started slow, nearly as slow as the speed at which Tsuyu herself was moving, but quickly started to speed up. By the time Tsuyu was halfway down his cock Momo’s hand was shooting up and down as well as moving in gentle circles as she attacked Tsuyu’s clit. Her increased pace brought with it an increased volume and intensity of moans from Tsuyu, who was now leaking juices in great quantity. Thankfully, she never stopped her downwards momentum, ass clenching along with her thighs as she got closer and closer to resting that wonderful derrière in Izuku’s lap.

            Unlike Momo, Tsuyu only stopped that one time for the entire trip down. It seemed that one reassurance from them was enough to keep her moving without fear, Tsuyu’s pragmatism giving her the confidence to just keep going. Which was how Izuku found himself with a big ol’ butt sitting in his lap as Tsuyu collapsed in orgasm atop him. It couldn’t have been timed better, coming just as she her weight rested itself completely on Izuku, the combination of hand and cock driving her over the edge. Her orgasm came with far less shaking and twitching than Momo’s, matching the subdued noises she’d made so far that night. Instead, her strength seemed to just flee her body. Torso falling into Momo, his girlfriend’s hand disappeared to support the smaller girl’s weight.

            “Definitely has a quirk.” Tsuyu’s sentence was soft as she caught her breath, still resting on Momo. “No way this should be possible.”

            Izuku agreed wholeheartedly. While the size of Tsuyu’s ass meant that an inch or so of shaft still sat outside her pussy, her cheeks leaving plenty of space between her pussy and his base, he’d wager that his cock would be sitting fully between her breasts. Momo’s shocked gasp suggested that that was probably the case.

            “Oh my. Seeing it on me was one thing…but yes. It does feel good though, doesn’t it?”

            “Yes. Very nice. And Izuku? Thanks for not grabbing me. I appreciate it.”

            Izuku barely mustered a response himself, enjoying the squeezing sensation of Tsuyu’s pussy around him. She felt…slicker than Momo. Perhaps not quite as warm, but more moist and almost softer than his earlier experience. That made sense. She was cold-blooded, at least somewhat. “Oh! Uh, yeah. Not sure you should be thanking me, but you’re welcome?” He was pretty sure he was the winning party in this situation.

            “If you keep it light, I think I can handle it now.” That tantalizing invitation put out in the open, Tsuyu started the climb upwards. Her feet braced themselves around his waist, pelvis thrusting out as she lifted herself up his cock. Even with permission granted, he waited to act. He wanted her to get into a rhythm first. That, she found rather quickly. Unlike his first time with Momo, Tsuyu seemed unconcerned with making full use of his cock. Well, it wasn’t like it mattered. The amount she was riding up and down on was enough to satisfy any size queen. Even if it meant that nearly half a foot was always in her.

            Instead, Tsuyu seemed more concerned with the rhythm of the sex. Her hips moved up and down with ease, her ass always lagging slightly behind. The control over her hips reminded him of the dancers in some of the videos Mina liked to show them. A dancer dancing on his dick. When she switched from going up to going down, each cheek would move down for just a bit longer before jiggling back up. The same was true for the reverse, orbs slapping slightly upwards as the rest of her went down. This created an irresistible jiggling that easily hypnotized Izuku.

            Eventually Izuku could no longer resist the urge. His hands rose, burying themselves in Tsuyu’s lower cheeks. As with Momo’s tits, there was far more to hold onto than he could ever hope to grab, and Tsuyu had said to be gentle. It also just felt different. Momo’s breasts were large but gave away easily under his grip. They were easily malleable, soft yet substantial orbs that floated and flopped around under his touch. Every inch of them could be squeezed, pinched, and rolled around. He could bury a hand in them entirely, allowing the flesh to flow between his fingers as if Momo’s skin was more of a liquid than a solid. It made them extremely fun to play with.

            Tsuyu’s ass, though, was all muscle. He couldn’t dig into it in the same way as it was much firmer, more resistant to change. That didn’t make it any less pleasant to grab hold of though. He could feel it flexing and shifting around as she moved in his hands, muscles expanding and contracting before his very eyes. The way it jiggled after every touch was also extremely arousing. Every little movement he made against it caused the expansive flesh to eventually shift back to its natural position, the mass and momentum causing it to shake before his very eyes. He wouldn’t dare to slap it, but it gave him a pretty good idea of how incredible the sight of that would be. And why some people were into that sort of thing.

            He never lost focus on the squeezing of his dick either. Tsuyu moved at varying speeds, increasing and decreasing in pace while she varied the amount of cock she was riding. While none of it could be described as “frantic”, it still caused shockwaves to run across his dick as the friction caused him intense pleasure. He was eventually forced to relinquish his hold on her ass as the glorious sensations imparted by sex overwhelmed his neurons. The view was incredible, watching Tsuyu shoot up and down his length as her ass quaked in his view.

            Her second orgasm of the night accompanied his first. He felt his own coming on first, starting in the balls as they always did. He called out a futile warning, Tsuyu not even hesitating in her movements. She had said she wanted to see what would happen, he belatedly remembered. Hopefully she was on the pill then.

            Her orgasm came quickly. Momo’s tended to have a lengthy buildup, but Tsuyu’s lacked that kind of a tell, her body simply collapsing once again, Momo there to catch her just as before. Her walls tightened, squeezing him even as his own cock expanded. This time he didn’t feel a stream flowing to his left penis, likely due to a lack of attention. That didn’t matter. His right was more than enough of an outlet. It pulsed against Tsuyu’s walls, blasting directly into her. He groaned as stars swam in front of him, falling into the mattress as all his energy was diverted to pumping semen into Tsuyu.

            The whole room was quiet for a minute after that. He was left deeply breathing while Tsuyu let out shaky gasps from her position on Momo’s shoulder. Momo seemed to be whispering sweet nothings into her ear, eventually helping to straighten Tsuyu out, cock still buried in her snatch. That didn’t last long, however, Tsuyu half-standing and half-falling off it as she laid next to Izuku on the bed.

            “Wow.” That one word caused pride and warmth to appear within him. Which had been happening more often lately. Who knew that rocking a woman’s world would tickle the same tendencies that helping people did? He certainly hadn’t expected it, but it was welcome.

            “You were amazing.” He answered her, looking her in the eyes as Momo came to lay down on her other side.

            “Thanks. You’re gifted, Izuku. I can already feel my quirk changing.” Both he and Momo perked up at that.

            “So, it does happen right after ejaculation?” She asked, the most cognizant of the two.

             “Yes. My legs feel much stronger than normal.” That was saying a lot. Her kicks did a lot of damage normally. “And it feels like I can make my secretions more potent. And check this out.” And then Tsuyu vanished from view. All he could see were the socks still on her feet, toes wiggling in them. A moment later she was back.

            “It seems like Izuku’s quirk does indeed enhance all the aspects of the user’s quirk. Regardless of quirk type. I could produce gasses and liquids, and the rest of my quirk was also boosted. And it looks like you got a strength boost, enhanced poison, and improved camoflague. At least.”

            “We should test out the strength and poison tomorrow. It should last until then.” Izuku entered the conversation.

            “Let me try something else.” Tsuyu opened her mouth, tongue lancing out into midair. It didn’t look any different than before, except that it just…hovered…in the air. Then the tip started drawing figure eights above them, before extending even further. Izuku propped himself up to watch as the tip of Tsuyu’s tongue fattened and absorbed one of Momo’s whiteboard markers. She then wrote on the board, crossing out the question mark next to the yes on question one, put instant next to question three and checked off mutation on question six.

            “Can you cross out oral? On question four.” And then oral was crossed out. Apparently Momo hadn’t gotten any sort of boost. Tsuyu let the marker drop after that, retracting her tongue.

            “Maybe it adds one new feature to the quirk as well.” She mused, “I think I can use telekinesis on my tongue. And apparently change its shape slightly.”

            “We’ll definitely need to explore that tomorrow. Now, though, I want my turn.” Momo looked over Tsuyu at Izuku. “Tsu? Do you want to go again?”

            “I wouldn’t mind. I’d like to stick to the right though.” She blushed at her admission, apparently still intimidated by the longer of his cocks.

            “That’s alright by me. How do you want to do this?” Apparently, he was just frozen out of the conversation.

            “Can he do both of us at once?” Tsuyu grasped his penises at her question, moving them around. It was easy enough to put them into various configurations which seemed to satisfy her.

            “He can do the work too. If we stack on top of each other then he should be able to penetrate us at the same time.” Momo did seem to be a fan of making him do the work.

            “That sounds good.” Momo moved to make herself comfortable, gesturing for Tsuyu to join her. Tsuyu, however, hesitated. “You haven’t orgasmed yet, have you?”

            “No. But I’m sure I will.”

            “Let me try something first. Izuku, can you help?” Izuku, dutiful boyfriend that he was, nodded. Tsuyu directed him to the other side of Momo, Izuku moving around the two bodies on the bed as she moved between Momo’s legs. He was pretty sure he knew what his job was, and he moved to perform it immediately. He brought one hand over Momo’s folds and delicately stroked them. She was soaked. No doubt the sight of Tsuyu being penetrated had done a lot for her arousal.

            Tsuyu joined him shortly. Her tongue lanced downwards, the tip coming to hover just next to his own palm. He watched, fascinated, as her tongue stayed in midair for just a moment before gently lowering downwards and piercing Momo.

            “I don’t think I can get nearly as thick as Izuku but hopefully this works.” Izuku had trouble parsing Tsuyu’s words while she had her tongue out, but he was pretty sure he got it.

            “Ohhhh myyyyyyy.” Momo moaned out in pleasure. She moved her hands moved to play with her tits, kneading and squeezing them as Izuku’s own ones went to work lower down. His fingers reached under the folds that usually hid the clitoris from view. Momo’s arousal made certain that he could access more than just a tiny nub. Two digits glided across the exposed portion, rubbing at it as he enjoyed the sounds coming from Momo. Tsuyu was just as invested in the activity, tongue dancing around inside and outside of his girlfriend. Every now and again she’d retract and use her organ to lick at Momo’s drenched outsides before going back to work on the inside. The moans Momo was making at their combined ministrations were a good reminder for Izuku that a penis wasn’t the only way to pleasure a woman. He’d have to experiment in the future. Maybe he’d ask Tsuyu. She clearly knew what she was doing.

            He made sure to vary his activities as well, recalling the motions he’d seen Momo performing on Tsuyu earlier. What started as rubbing up and down along the clit moved to include circles and figure eights as he experimented; his goal was to discover what made Momo feel best. Unfortunately for Izuku, Tsuyu’s work made that much harder. Her tongue made it seem as if Momo was enjoying everything to a great extent. That didn’t stop him though. He tried rubbing, tapping, and even flicking in his exploration of female anatomy. His other hand didn’t stay idle for long either, moving to work at the folds below her clitoris whenever Tsuyu’s tongue was at work inside.

            Eventually he brought his own tongue into play as well. He hadn’t ever eaten a girl out before, but Tsuyu had inspired him, and all he had to focus on now was the clit. It was like being on easy mode, with Tsuyu’s tongue affording him an immense amount of leeway. He brought his face to Momo’s pelvis, inhaling the sweet scents of the nectar escaping into her folds as she did so. The mixing of sweat with arousal was far more pleasant than he’d expected, and he had no trouble opening his mouth to take a taste. He found the clitoris easily enough, the organ engorged by Momo’s arousal, and started rolling the nub around in his mouth with gentle ministrations. Apparently Momo liked that, because one hand left her breast to rest in his hair.

            Encouraged by the restraining limb, Izuku doubled down on his tongue’s motions. He focused intently on playing with the round bulb that he could feel, licking around it and sucking lightly on Momo’s skin. Nowhere near hard enough to leave a mark, of course, but with just enough suction that he could feel Momo’s fingers curl in his hair. He even felt Tsuyu’s tongue brush against his cheek once, likely coming out to lick at Momo, but that didn’t distract him from his own work.

            The combined attention of both classmates brought Momo over the edge sooner rather than later. As he’d observed earlier, her orgasm was far more obvious than Tsuyu’s. Her legs started quaking once again as her mouth opened in a deep gasp. Her head was tossed back, Tsuyu’s rising to observe the process while her tongue stayed buried in Momo. Izuku straightened up himself, eternally fascinated by the sight of his girlfriend wracked by pleasure. The shaking passed quickly enough, a satisfied smile blooming on Momo’s face as she looked over at both with affection in her eyes.

            “Now I can see why Mina recommended trying a threesome. Shall we move on?”

            Tsuyu didn’t hesitate. She clambered over Momo, straddling the taller girl’s hips and resting her own wider pair on top of them.

            “Do you mind if I top? And if I touch your chest?” Tsuyu asked Momo.

            “Not at all. To both questions. I’m sure Izuku would appreciate the view. This is for your enjoyment as well!”

            “Don’t worry. I’m having a great time.” Tsuyu’s still-soaked pussy confirmed that. And Momo was right. He was enjoying the view. Tsuyu had crawled over Momo’s torso to bring their hips level. That once again put him in the wonderful position where he had a perfect view of Tsuyu’s ass. This time, though, he could also see over her as he shuffled forwards towards the pair. From his vantage point he could see Momo’s breasts spilling out from under Tsuyu’s torso and into his field of view. They were comfortably held in Tsuyu’s hands already, his other classmate seemingly as interested in them as he was. Watching someone else fondle them would have brought him jealousy at any other point, but right now he felt more aroused than ever.

            Izuku forced himself to look away and focus on his own task. He grabbed both shafts, carefully guiding them into position. His longer, left one reached its destination first, brushing against Momo’s folds as he pushed forwards. He didn’t hesitate to penetrate. The earlier orgasm and their prior experience made him certain that Momo could take it. His left shaft was also thinner, making him a bit more reckless. The certainty with which he moved elicited a series of pleased moans from the headboard. She’d missed the feeling just as much as he had. This time when Izuku stopped it was because his right shaft was now at the point where it could enter Tsuyu. Not because Momo had told him to.

            He focused, doing his best not to get distracted by Momo’s squeezing his left shaft, and grabbed the right. He rubbed it against Tsuyu’s pussy a few times, reintroducing the head to the juices which it had extracted earlier this very night. And then he pushed forwards. Moving at a slight angle to keep his left shaft from shifting he pushed against Tsuyu, opening her folds with determination. Tsuyu’s gasps quickly joined Momo’s as his entry grew deeper. Shifting his weight again he straightened out between Momo’s spread legs. Tsuyu’s delicate feet, which rested on Momo’s thighs along with the end of the frog girl’s calves, made for excellent control handles. Izuku used them to guide Momo’s legs into a wider stance to allow him to continue forwards.

            He would have liked to continue moving at the pace with which he’d piereced Momo, but the sheer amount of pleasure he was currently experiencing prevented that. It was if every movement forward was accompanied by a static shock that forced him to draw to a halt, like a dog trying to cross an electric fence. Except instead of a static shock it was a twin-pronged blast of raw pleasure. His cocks seemed to be competing to see which one was enjoying their entrance the most, as every shift of his right shaft causes his left to release a simultaneous wave of pleasure to counteract the new sensations that its sibling was experiencing. And the same was true in the other direction. He couldn’t move without being bombarded by a wave of slick heat from both sides of his body, taut walls squeezing him all over.

            “You can move faster.” Momo’s moaned exclamation came from beneath Tsuyu, who just held up a thumbs-up in affirmation.

            “Sorry. It just feels…Fuck…it feels so good!”

            But if his lovers wanted him to go faster, then he would. He pushed onwards, hands guiding shafts into position as he did his best to return to the determined advance he’d first adopted. It was difficult. But he managed. Each shaft plunged forwards into its respective classmate, spreading walls apart as they went and breaking new ground with every shift of Izuku’s legs. Sure, his right had already been inside Tsuyu, but Izuku found it difficult to even remember that as pleasure flooded every corner of his being. The more he pushed forwards, the more he was tempted to lose himself to the sensation, scarcely capable of imagining the pleasure that would come once he started pumping in and out.

            But it was that very thought that motivated him to continue. If he didn’t follow through on Momo’s request he’d never get to the point of withdrawing, never experience the true extent of sexual pleasure. That wasn’t to say he lost sight of the joys of entering. Each inch that buried itself into pussy brought heightened sensations, every movement emphasizing Izuku’s carnal pleasure. The deeper he got, the more he felt how different Momo and Tsuyu were on the inside.

            Tsuyu was slightly cooler than Momo, but still warm. Like comparing a hot tub to a sauna. Both were extremely pleasant sensations, but in different ways. With Tsuyu, it was the contradicting sensations of squeezing and slickness that threatened to bring him over the edge, her warmth mixing with juices that invited his shaft to bury itself ever further. She was easier to enter than Momo had been due to this enhanced wetness. The tightness was no less intense than that of his girlfriend; it was just that Tsuyu’s internals were always perfectly lubricated. He almost didn’t have to exert any pressure at all to drive deeper. It was oxymoronic just how tight and small she was but at the same time how slick and inviting. Which produced those incredible sensations he found himself getting lost in.

            Momo, on the other hand, had a pussy that seemed to be built entirely for heat. Of course, she was still soaking wet with arousal, but that was less noticeable. She was just so warm. Maybe it was the contrast with Tsuyu, or maybe that was just how she was. Izuku didn’t really care. Her walls pulsed with flashes of heat as he dove deeper and deeper into her, sending molten arousal tingling up and around his veins. Every thrust forward seemed to cause the temperature to rise, silky walls parting to bring him ever deeper into their depths. Like the first time they’d fucked, it was a collaborative effort entering Momo, as opposed to Tsuyu who’s pussy seemed happy to do most of the work on its own.

            Both women were extremely tight. And warm. Just in varying degrees. Thankfully Momo’s pussy seemed to remember the promise of pleasure that his cock brought, even if he was using his left this time, and parted around him with as much pleasure as he had entering. And all the liquids sopping around inside Tsuyu made the going far less slow than the first time they’d fucked this evening. Plus, he got to move at his own pace now. And he was stronger than the force of gravity that Tsuyu had used in her earlier descent. So, he pushed onwards, long past the point where a normal set of penises could have penetrated with this degree of comfort.

            Looking down at their points of joining, Izuku was happy to see that by now most of each of his shafts was inside. He doubted he’d be able to go all the way with their current configuration anyways. The length of his cocks and the way they grew out of his body meant that they could easily adapt to the situation, but they were now entering crevices at different heights. With how hard they were, that meant giving up some length because they certainly weren’t going to be bending. It also gave him the opportunity to take notice of each woman’s respective folds. As he’d seen earlier, Momo’s opening was decorated with fleshy petals in much greater number than Tsuyu, however he’d be forgiven for forgetting about that now. The girth of his cocks was such that each was spread open with to such a width that it was difficult to tell the difference between them.

            And then he reached the point where he couldn’t go any further. All three of them were left gasping and moaning on the mattress. More than two feet of cock was buried in pussy at this point; his right was close to all the way in while his left still protruded a few inches out from Momo’s lips. Content with where he was, he turned his gaze upwards to the torsos of the women. He gently wrapped his hands around Tsuyu’s tiny waist, her ass affording him plenty to push against. Tsuyu’s own hands were back to work on Momo’s tits, digging in as moans and hisses escaped from her mouth. Momo seemed completely overwhelmed, torso flat against the bed with arms loosely draped around Tsuyu’s neck. It seemed the stimulation to her tits and pussy was making it difficult to think.

            Pushing slightly against Tsuyu’s fleshy backside, Izuku started to pull out. Just that first motion caused moans to rise from both girls. He joined them not a moment later. His buried position had left him with back slightly arched, thighs just forming the barest of acute angles with the mattress, and he set about undoing that work. He unwound piece by piece, back straightening and then curling slightly as his ass moved away from Tsuyu’s. Inch by inch he crawled out of their pussies. He could even feel his right shaft drawing out juices as if it were an oil pump, the pleasant sensation of warm liquid dripping down onto the left shaft that was exiting Momo.

            His hips drew back further and further as Izuku tried to figure out where the right stopping point was; the size difference between his shafts meant he couldn’t just go out all the way. The decision was made for him when he saw the edge of his glans exit Tsuyu. It left his arms almost completely extended with hands still anchored around her waist. He had to push slightly forwards again to get to a more comfortable position, waiting there for a moment to observe the other two members of the tryst. It looked like Momo had pulled Tsuyu down slightly; whether it had been on purpose or not wasn’t important. Tsuyu’s hair had come cascading off to the side at the shift which meant he could only see one of Momo’s breasts now. It did look like Tsuyu was still busy with her groping though.

            When he received no instructions aside from moans from the two, Izuku felt safe taking matters into his own hands. He braced himself on Tsuyu once more before plunging ahead. This time he didn’t hesitate, any jerkiness gone with his words. His hips glided through the air to force his shafts forwards, Izuku bringing his torso forwards slightly as he adjusted his balance. Both of their pussies flexed inwards under the strain produced from his shafts, forced to bend instead of break as he dove forwards. Their moans also heightened at the return to forwards momentum, Tsuyu’s volume increasing to a height he hadn’t heard before. The normally quiet girl’s croaks soon meshed with Momo’s moans rather than be drowned out by them, a testament to her pleasure.

             Izuku let his hands roam over Tsuyu’s globes as he pushed forwards, his momentum meaning that he didn’t need the purchase on her hips. Instead, he massaged the ass he’d been staring at. He dug into the strong muscles that were one of Tsuyu’s most defined features, apparently even further enhanced by the load of semen he’d dumped into her earlier. They didn’t look any different, but he was fine with that. Her ass was more than enchanting as it was. His palms rested atop it, rubbing, digging and fondling the object of his attention He did his best to bring his hips into contact with those glorious cheeks, but was forced to stop lest his left shaft twist into a truly uncomfortably position. That was too bad. He wanted to watch that ass jiggle.

            His hands then moved even further down the globes, wrists bending to allow him to push off against Tsuyu. He made use of the added leverage to withdraw once again. His speed increased with the use of his new anchor, sliding out of Tsuyu’s sopping pussy and Momo’s burning core with increased ease. Even if both canals seemed to cry out for reinsertion, Izuku had no trouble moving out. The amount of pleasure he got from the friction on the way out was far too nice to ignore. And it wasn’t like he planned to be away for long. He also didn’t worry too much about how far he withdrew this time. More than enough cock was shifted around with his movements than was needed to provide pleasure. Also, he had two of them. Which seemed to mean more than double the sensation.

            Staying in a comfortable bend, Izuku’s hands again moved over Tsuyu’s ass to rest at her waist. Using Tsuyu’s body as a pillar once more he pulled forwards. The added purchase granted by that hold as well as Izuku’s own considerable strength allowed him to easily find a thumping rhythm that had him going both further and faster than before. Tsuyu and Momo didn’t seem to mind much: the sounds they made only got louder as he got faster. The one consequence of this seemed to be that Tsuyu enjoyed the pace a bit too much. She lost her hold on Momo’s breasts as Izuku started using her body more seriously.

            Just before she did, though, Izuku felt Momo clamp around his left shaft as her body shook in orgasm. Apparently, he’d been right. The combination of tit groping and pussy plunging had a done a number on her senses. He watched as Momo’s eyes rolled back into her head, arms spasming alongside her legs as she vibrated with pleasure. Tsuyu seemed to enjoy the sight as well, burying her head in Momo’s neck and kissing it as the taller girl lost herself to joyous bliss. Tsuyu’s head stayed there even as Momo came down from on high, pinned by her grip on Tsuyu’s neck. Tsuyu didn’t seem to mind, reinforcing her more secure position with her forearms, palms placed next to Momo’s head while she bent at the elbows. The increased stability afforded by the position only made it easier for Izuku to continue his motions.

            The pool of liquid between his legs grew as he moved, juices from Momo mixing with the flood coming from Tsuyu as Izuku continued to plumb the depths right through her orgasm. The feeling of constricting walls only encouraged him as Momo shook on the bottom of their little pile. His motions continued to drive Tsuyu further and further against Momo as he pushed downwards and forwards. The short girl didn’t bother readjusting when he pulled out, realizing the futility that came with that. He’d just push her right down again on the backswing.

            It wasn’t like she minded either. Tsuyu busied herself with exploring Momo’s neck and face, mouth kept busy at it as Izuku plowed into them. So arousing was the sight of Tsuyu nipping and kissing his girlfriend while he fucked them both that Izuku gave into the temptation and buried his own face in Tsuyu’s hair. Her hairstyle made it easy enough to move the thick locks off to one side, giving him free access to her neck and the side of her face. He continued moving in and out even as he lightly kissed along her exposed shoulders and up, although he was forced to shuttle less shaft in and out as he did so.

            His attention to her neck drew Tsuyu up slightly, face turning to meet his in another kiss as Momo watched from below them. His girlfriend’s visible blush and panting was approval enough for him, his tongue darting out to meet Tsuyu’s as saliva was swapped between them. The French kiss was loose and chaotic, Tsuyu’s large tongue darting around and easily taking control. She even licked his lips a bit before diving into his mouth easily. She peeled away after a thorough examination a gasp. There was no break from Tsuyu after that either. She didn’t hesitate in returning to Momo’s level, tongue again darting out as she initiated another session of Frenching. Izuku could only watch, transfixed, as she moved his saliva from her own mouth and into Momo’s.

            That act alone was so arousing that he had to consciously resist ejaculating right then and there. Although he resisted the urge, it did drive him into a bit of a frenzy. Rising to a more advantageous position he let his hands dig into Tsuyu’s ass with more force than he had previously. While the muscle didn’t yield easily, it still afforded him a better grip as his pace picked up. He refused to give into the primal force he’d drawn from during the loss of his virginity, instead focused on using as much of his cocks as he could, as quickly as he could. The speed and force with which he withdrew extracted an audible splash of liquid from someone’s pussy, but he didn’t bother to check whose. His eyes stayed entirely focused on Tsuyu’s slim torso and Momo’s panting face.

            He pumped forwards with similar force, eyes widening as he witnessed his earlier attempt at making Tsu’s ass shake come to fruition. Even if he didn’t have the ability to clap thigh to cheek, the power behind his thrusts caused Tsuyu’s torso to shift forwards, weight pounding into her arms. Those, however, were braced on the mattress and stopped her from moving too far. The whiplash generated by that stabilization then caused her ass to shake in front of Izuku’s eyes, its momentum carrying it just far enough to elicit clear jiggles. Emboldened by the sight, he continued to ramp up the pace. With one long pump after another, Izuku drove into and out of two pussies at once. Each thrust elicited moans from mouths, groans from himself, and progressively more intense quakes of Tsuyu’s rear.

            The entire group let themselves go from that point. Izuku was pretty sure he felt both Tsuyu and Momo orgasm at least one more time as he pistoned in and out of them with powerful pace and energy. He used the lengths of his cocks to the fullest, drawing them out and back each time before driving them back in with desperate need. He reared up on his legs as he did so, arms outstretched and grasping at Tsuyu’s ass as he half-mounted both girls. It felt good. So. Fucking good. To be looking down at those two incredible bodies as his cocks ravaged their insides. The pleasured moans and exclamations that followed in his wake only enhanced his own pleasure, his joy at bringing his partners up and over the edge heightening his own experience.

            All that put together meant he couldn’t last too long either. When he felt Momo clamp down once again, he knew he wasn’t going to make it through. When Tsuyu’s walls also spasmed, he knew it was over.

            “Fuck! Fuck! I’m cumming!” His voice came out hoarse and guttural. The flood started from his loins as every nerve in his body felt like it was lit on fire. And then everything was numb, rendered moot by the force of the orgasm that rocked him. While he couldn’t see them, he knew his cocks were both pulsing, buried as they were, shot after shot of semen leaving his body and entering Tsuyu and Momo. Both moaned together, Tsuyu losing control of her tongue once again as it fell into Momo’s open mouth. Somehow that pushed him even further over the edge, undiscovered reservoirs of cum being dumped out of his body and into their targets.

            By the time everyone came back to reality, all three of them were once again lying next to each other on the bed. This time Momo was in the middle, Tsuyu and Izuku on the outsides.

            “Can I sleep over?” Tsuyu was the first to speak. Izuku looked over, taking in the sight of both women flushed and leaking semen from their orifices. Momo’s breasts looked particularly tender, but they both wore matching expressions of joyous satisfaction.

            “Of course. Trouble walking?”

            “That, and its cold. And the bed’s warm.”

            Momo’s sympathy was apparent on her face. She gestured for all of them to rise momentarily, stripping the bed of its soiled sheets in an instant. It took just as little time for her to manifest a new set of bedding, her unenhanced quirk more than capable of such a job. She even handed Tsuyu and extra thick wool blanket for the amphibious girl to warm up with.

            They were tucked in moments later, Izuku taking the middle position as they fell asleep. Tsuyu attached herself to him tightly, likely feeding off his body heat while Momo was content with just claiming an arm once again. Her head rested against his neck while Tsuyu placed her ear just over his right nipple, Izuku more than satisfied with his position and excited for yet another night of perfect sleep.
=SPOILER WARNING FOR ANIME ONLY VIEWERS! YOU’VE BEEN WARNED=
This also marks the end of sexy time. I’ll mark the end of spoilers and summarize below that as well.

             While the rest of the night was just as peaceful as he’d hoped, Izuku didn’t wake up as he’d expected. Instead, his eyes opened to the darkness of his own mind. He was greeted by the smiling face of the one person he really didn’t want to see after having sex.

            “Heya kiddo!” Nana’s smile was far too wide. “Looks like you’ve been busy while I was asleep!”

            “Hey Nana. I didn’t expect to see you.” Izuku tried to dodge the insinuation.

            “I’ll bet you didn’t! But I also didn’t expect to see you having a threesome! On your second time! You might have set a record; you definitely beat mine!”

            “You watched that!” Izuku was mortified. He wanted a nice, peaceful wakeup with Tsuyu and Momo. Not teasing from the seventh wielder.

            “Oh, I’m just fuckin’ with ya! I didn’t see. I just saw the two girls asleep on your chest. Actually, that’s not why I woke up at all.”

            “Oh? What happened?”

            “Well…I really got woken up because you finally manifested your original quirk! Nice job! That was quite the surprise.”

            “So, you’ve been up for a few days then? Didn’t you say you didn’t watch the threesome?”

            “And so, he does admit it! But no. I did wake up then, but we were all pretty sure you had your own quirk, and this was just confirmation. So, I went right back to sleep. And before you say anything, we wanted you to figure it out yourself and not get your hopes up. What woke me up for real was a second new quirk showing up.”

            “A second one?” Somehow Izuku could just about predict what she was going to say next.

            “Yeah. Based on your memories, you and Momo’s theories about your right dick are correct. It’s your left one that I think I can help with. It looks like it makes a copy of the quirk from whoever you ejaculate in.”

            “You’re sure it’s a copy?” Izuku had enough experience with quirk theft that he was immediately afraid of the alternative.

            “Yeah. There’s no consciousness that goes along with it, and it’s also definitely temporary. It’s like…like it’s already fading. I suspect you only get access to it for forty-eight hours with how it’s going. Which is kind of unfair when you think about it.”

            “Because the boost doesn’t last that long?”

            “Yeah. Classic male. Even your sex quirk is more worried about you than your partner.” Nana’s smirk brought a smile to his own face. It was kind of true, so he couldn’t outright deny it. Though, if he could have flipped it, he would have.

            “Thanks for the head’s up. I’ll make sure to test it out and let Momo know.”

            “You do that! Now, I’m back to bed. As much fun as it would be to watch and tease you about the all the sex you’re going to have, you deserve a break. So, enjoy yourself! And wear condoms! Or don’t! Up to you!”

            With that, Nana flickered out of view and light filled his vision. When he came to again, it was to the sight he’d hoped to see the first time. Even the knowledge of new mysteries couldn’t temper the smile that came to his face at that.
=END OF SPOILERS=
Summary: Izuku has figured out that apparently his left cock, instead of enhancing the quirk of whoever he has sex with, gives him a temporary copy of their un-boosted quirk.
=================================================


Hi! If you made it here, thanks! I hope you enjoyed the chapter! Constructive criticism is always welcome if you didn’t: I’m quite new to this! 

I’m settled on 9 chapters for the story, a few more than first planned because I’m enjoying it.

I’ve pretty much planned it out entirely, with almost all chapters set in stone. However, I have one open slot for someone/someones in a later chapter (either 6 or 7). I’d like to gauge who people are most interested in seeing, out of girls or combinations of girls that are in 1-A and/or 1-B. I’ll hear suggestions about characters outside of those parameters as well, but I’m leaning towards a yearmate.

The one caveat is that I won’t be writing Jiro in this fic. Sorry to all the Jiro fans, but there are some hefty hints in the manga that she and Kaminari will end up in a relationship and this fic takes place in such a future. Izuku’s just not that kind of guy. Everyone else is fair game. 

Thanks for reading!
 
 

             
 
 
 


