There is one I have been looking for for some years now.
I dont remember what the woman's relation was to the man but she was being a bitch for one reason or another.
Details about it is that they know each other for quite some years, and he joined the karate/judo/whatever club for her(protect her or look cool idr).
She is unfazed until at some point she sees/feels his abs, her kink.
The whole thing happens at his room/house, the club is irrelevant other than that he has abs now.