Chapter 0 - The Experiment

The Experiment


The door slammed as a male voice began to shout out angrily.

“Sofia! What the hell?! Where’s my damn razor?!”

Sofia looked up from the kitchen table, already dressed in her workout attire, where she was quietly eating a low carb breakfast while watching the news on her smartphone. She seemed rather nonplussed at the sight of her brother storming in from around the corner, completely naked except for the wet towel wrapped around his waist. The entire lower half of his face was covered by a beard that couldn’t quite hide that weird scowl he always wore when he was particularly perturbed.

“Razor? Don’t recall. Maybe you lost it again, Daniel. Just like you lose pretty much everything. You really should find the time to organize your things, little brother.”

Daniel roared in frustration and then stormed loudly back to the bathroom. Sofia smirked and chewed on another spoonful of granola berry yogurt parfait. Truth be told, she hid her brother’s razor because she had to pull out a gigantic ball of man fur out of the drain for what was probably the fifth time that week and at this point she was getting sick and tired of it. And this had been occurring ever since Daniel had started his new job; which he suspiciously kept secret from her. What she did know though was that ever since he began this ‘job’ he had been growing an absurd amount of hair, not to mention he was hella ripped -- like, so ripped it was unreal. He had always been a weight lifting nut, but he had trouble gaining muscle mass. Then one day it was like his muscles just exploded in mass. She was getting suspicious that he was taking some kind of experimental steroids. That was the only thing she could think of to explain the change.

Her phone rumbled. Sofia looked down to see that her friend Diana had just sent her a text message.

“Waiting at the gym~ ^-^ Are you almost done?”

Sofia picked up the phone and quickly texted back.

“Almost done with breakfast! Lemma get my V and I’ll be on my way.”

V referred to her vitamins. Sofia was a huge believer in the healthy diet and fitness lifestyle, which is how she kept her perfectly slim cut figure. While she continued to text back and forth with her friend she walked over to the kitchen cabinet where she and her brother kept all their medicine, supplements, and chewing gum packets. However, as she reached in to grab her normal vitamins she accidentally grabbed a small white bottle that was missing it’s label. She took off the lid, shook out a pill, and downed it with a bit of water, thinking nothing of the missing label since it looked just like her normal morning vitamins.

As she left she grabbed her towel and water bottle, leaving behind an empty bowl in the kitchen. Several minutes later after she had shut the front door behind her, Daniel ran back in looking alarmed as he booked it over to the cabinets and drawers.

“Shit! Shit! Shit! Where did I leave it?!”

He opened and shut many doors, eventually opening up the cabinet that Sofia stored all her vitamins in and snatched up the exact same unlabelled battle. He stared at it as he gripped it in his hand, then ran his hand on the floor of the cabinet, finding and grabbing a small worn sticker that had fallen off.

Warning: Only Safe for Male Consumption

“Phew. I nearly lost it.” He breathed a sigh as he put the label back on, running his thumb over the sticky label so it wouldn’t fall off again this time.



As Sofia pushed through the gym’s door her friend was already there, swinging her feet while sitting on one of the weight benches just humming to herself with a couple of earbuds on. Sofia smiled. She was always a little bit jealous of the easy going cutesy attitude her friend managed to pull off so easily. It attracted a lot of attention from guys with a certain taste in innocent child-like attitude wherever they went together; whereas she had a more grown up and mature complexion which was helped by the fact that she was at least a couple more cups sizes larger than Diana. That attracted its own sort of men.

“Oh! You’re here? Why didn’t you say anything?” Diana had spotted her and pulled her earbuds out as Sofia approached. Then she blinked, tilting her head as if she was studying something really closely. “Hmm? That’s weird. There’s something different about you today. Did you do something different with your hair?”

“Not... really?” said Sofia questioningly. Since she was a brunet Diana always did her hair the same way every morning; cut above the neckline. But as she reached to touch her hair she realized it had grown past her shoulders somehow, even though she was certain it wasn’t like that this morning. “Or maybe I did?”

“Hold on a moment, I got you~” said Sofia, pulling up and reaching into her bag for an extra hair band. She gestured for her friend to turn around and then tied her hair into a ponytail as if she had done so a million times. “That’ll do! Don’t want it getting in the way, right~?”

Giggling, Diana ran over and grabbed a couple of light weights. Typically all they ever did were a bunch of cardio exercises and stretches to keep up their figures rather than to build up any serious muscle.Today however, as Diana put down the weights and positioned herself in front of Sofia, Sofia felt just a little more galvanized.

As she placed her hand on Diana’s inner thigh and helped lift her left leg up in the air for a deep stretch, she felt a sudden urge to press into her friend’s backside. So that’s what she did, pushing her crotch up into Diana’s soft butt in a way that if she had a cock it would be perfectly sandwich between those cheeks. While her right hand squeezed Diana’s thigh, her other hand reached down and placed itself on her waist, keeping her balanced while she pressed her boobs into her friend’s neck. Leaning over, she grazed her nose through the curly blond locks of her friend’s hair before taking a deep whiff of that fragrant floral scent.

Sofia opened her eyes to the image of her friend’s face blushing madly clearly embarrassed in the wall mirror, but she didn’t seem to want to stop her even though there was steam practically coming out of her ears.

“U-Uhm… S-Sofia~?” Sofia blinked, realizing what she was doing and let go as her own cheeks began to light up. What was she doing?! This was her friend -- and she was straight the last time she had checked. Diana put her leg down and was still blushing as she gripped her own arm timidly. “A-Are you feeling okay?” she asked, not able to turn around to look her friend in the face. Heart pounding in her ears, Sofia stared at her hand in confusion for a second, opening and closing it several times before answering. Did her arms seem bulkier or was that just her?

“Y-Yeah… I think I’m just a little worked up. I think I’ll switch up my routine today, if that’s alright. I think I need to let off a bit of steam.”

Diana nodded her head, her face growing redder as she glanced at Sofia in the mirror. Sofia was even more different than before in way more obvious ways. Her muscles had become larger and more defined, and the hair band that Diana had used to wrap her friend’s hair had snapped as Sofia’s hair had grown down nearly to her waist. Everything about her seemed… wilder somehow, like she had just come straight out of the jungle.

While Diana continued doing her light aerobic exercises Sofia placed a large forty five pound weight on both ends of a weight bar before laying down and positioning herself under it. Diana found herself unable to look away, watching hungrily as Sofia began her repetitions. Her friend’s muscles bulged so…hypnotically. She caught herself chewing on her lip and tried to look away. Heart racing, taking a deep gulp, Diana turned back and watched the sweat roll down her friend’s abdominal muscle which was now glistening under the fluorescent lights.

That’s when the smell hit her.

Diana gasped as the musk of her friend’s sweat wafted across her nostrils, causing her to drop her two and half pound weights on the ground. Sofia was too distracted to notice that her friend was walking over until the sudden sensation of a tongue running across her navel broke her concentration. She yelped, craning her head over to try and see over her boobs.

What she saw made her catch her breath. Diana’s eyes were completely glazed over, her mind clearly running on instinct as her friend’s pheromones took control of her body. With a grunt, Diana hoisted the bar back on the rack and sat up, grabbed her friend by the head, and pulled her in for a deep kiss in which she plunged her tongue into her mouth and wrestled them together. As they became tangled, her friend moaned, triggering some kind of animalistic inside of Sofia’s mind. Without thinking, she wrapped her arms around her friend’s waist and pushed forward, slamming her against the wall as they continued to grope and loudly make out. She could stop herself. It was like something primal had taken her over. All she could think about was the unquenchable desire to fuck Diana and hear her moans. Her blood was practicaly boiling as her pants grew so tight it hurt. That’s when she broke off the kiss to look down, noticing the bulge that had formed.

“Wh-what the heck?1”

Sofia pulled down her pants releasing the cock that had formed out of her clitoris. A large amount of pubic hair had grown right above it, and like her other hair it was wild and unkempt, and it felt good to have it brush against her friend’s quivering damp mound. The cock itself was absolutely huge, nearly log sized, with thick veins bulging down along the shaft. It was so sensitive that even just brushing it against something, like her fingers, sent jolts of electricity up her spine. Needless to say, it was a shocking sight to behold.

“I-I… what’s going on?!” Sofia was now feeling quite alarmed. She looked at her bicep and only just noticed how much larger and bulgier it was than when it was this morning, not to mention all the hair growing from her armpits and crotch; and as she looked again at her friend’s face she was struck by just how dumb happy she looked. Like, her tongue was drooping out of her mouth for crying out loud, and the drool was dripping down her chin. She was about to let go and step away out of anxious fear, but suddenly she felt hands grip her wrist. Diana was mumbling something.

“Nuuu… d-don’t leave meh~” Sofia’s mouth went dry at the sight of her horny girl pal nipple poking out of her sports bra. Without any semblance of shame or embarrassment she was rubbing her damp crotch against Sofia’s leg. But some semblance of control was holding her back.

“N-No… this isn’t right… you’re not thinking straight… I-I’m-”

“Breed me, Sofia~ Pleash~” She just kept on begging until Diana couldn’t take it any more. Her cock was absolutely throbbing as it pressed against Diana’s exposed stomach.  Something snapped. She could no longer control herself. With a snarl she grabbed a hold of Diana’s shorts and ripped the front of it off to expose her friend’s sopping cunt.

Wrenching Diana’s leg high up in the air by gripping her by the thigh, and lining up her shaft with her other hand, Sofia plunged her cock inside without even attempting to ease it in. As a result the thrust was felt as if a fist had just punched directly into her friend’s fragile cervix, breaking through and plunging deep inside. This brought out a garbled scream of deranged rapture out of Diana’s mouth while her hand propped themselves against the wall in a vain attempt to keep herself steady.

“D-don’t stop~! Don’t ever stahp~!” screamed Diana, slurring every word as Sofia wrapped her arms around her leg and just went to town. Sounds of wet pistoning slamming in and out of the lust deranged girl filled the gym as her pussy lips was stretched by the sheer girth of Sofia’s recently introduced manhood.
Gritting her teeth, Sofia became little more than a beast of pleasure as her iron grip kept Diana solidly in place. She had always wondered what it felt like to have a cock, but she had never dreamt it could feel this good!

“Fuck. Ah~ You’re so fucking tight~! I can’t… hold it much longer~”

She felt the pressure building up, and she wouldn’t be able to hold it much longer with all this rough fucking. Eventually, as a surge of blood rushed to her cock, and roar came out of Sofia’s throat, a flood of virile jizz came gushing out to fill her friend’s womb.  Thick, hot,  virile sperm geisered out with enough pressure that it pushed the wall of Diana’s womb back a bit. Each pulse sent another, then another, until the baby batter had filled her from top to bottom.

Sofia began to wonder why it was that her friend had suddenly become so quiet. She cracked open her eyes to look. Diana’s eyes were rolled way back having gone completely limp with her arms dangling pointed downward. One glance and Sofia could tell that her friend’s brain was completely fried. For some reason, she found that she actually liked that dumb look of blind acceptance on her friend’s cute face. She had wanted to see it like that for a while now, and as Diana’s stomach began filling up like a water balloon under a faucet this was the perfect opportunity to snap a mental image.

As the drop of jizz began to peter out Sofia gave a grunt and pulled out with a loud wet pop. Diana dropped like a puppet that just had her strings cut, her face a completely depraved expression as she lay slumped against the wall. Globs of cum dribbled out of her agape pussy, and Sofia couldn’t help but smirk in satisfaction at the sight.

Something caught her attention though as she glanced to the mirror.

“Holy shit, I’m built like a goddamn amazon,” she said in awe, flexing her arm. She was a lot sweatier after that work out and smelled like she needed to hit the shower. But just one glance at her Diana and she knew she couldn’t leave her like that. Rubbing the back of her head, she strained her brain into thinking of a solution. “It’s a good thing we were the only ones here. I don’t think I could have kept this under wraps. Maybe if I…”

Sofia grabbed a nearby towel and wrapped it around Diana’s waist. That should serve her needs for the moment. Clapping her hands in satisfaction, she leaned down, picked the girl up, then hoisted her over a shoulder. She was going to have to take her home with her -- then eventually figure out what the hell happened.

After Sofia slid Diana into the passenger seat she walked around and buckled herself and her friend in. The only thoughts in her head as she drove home was how she’d punish her brother if she found out he was behind all this.


