There's a oneshot I saw a while ago and I'm looking for it again. I remember most of the story, but not the name of the piece or its author (and I don't think it's been translated). The main character has a friend with benefits (I think she's manager for his team). She basically approached him one day and said she got a boyfriend but he's not ready to go all the way, so she wants someone to help her with stress relief until he is ready. As a result, she's doing everything with him until one day her boyfriend finally agrees to take their relationship to that level. She tells the MC this, and asks if they can still hang out and talk because she really likes him, but he calls her an idiot and refuses, thinking as she leaves that there's no way he could do that since he's actually fallen in love with her. Only other thing I remember is the girl is petite and quite flat, though still believable as a high schooler.

Also, I don't know how old or new this is. I'm pretty sure it's no earlier than 2010, but it could be as recent as the last couple months.

Can remember some netorare/netori fitting the first half of the description but nothing fitting the second half (about the guy leaving the girl).
So I'm pretty interessted =)

The closest I could find is the reverse is the chapter 3 to the end of "Watashi no Shinai oo na koto" by Shunjou Shuusuke.
I really love this story so I'd probably love the reverse.