I have read a similar premise in M/M/F before and liked it a lot, so I had high expectations for the story. For the most part it delivers. There were a few too many scenes in my opinion. Several scenes at the beginning were necessary to establish each individual's needs and personality, but the same is not true toward the end. The one (sex) scene toward the end when Jay is trying to comfort Austin I found myself skimming through. 
 I'm also not sure how necessary April's character was. I know she was there as a pest and a catalyst for Liam's mental spiral, but she wasn't entirely necessary for that. I just felt she could have been more useful, but it was a missed opportunity. She was a distraction instead of the critical point she was intended to be. And I thought Jay should've blown up at her a lot earlier than he did. She could've called Liam back after Jay blew up. There was a lot she didn't do which, because she didn't, made her character feel superfluous to the story, which is not the feeling you're supposed to leave with. We also don't get to see any of the final fallout with her after Jay blows up, which mentally underscores her lack of importance to the story. She was a plot device and nothing more. 
 The characterizations of all the characters were great though. The feel of each was clearly defined and matched throughout the story. The varied needs of each sub was handled very well. And I generally liked all of them because they felt real. 
 This is 3.5 stars for me.