A few years back I saw a hentai comic and I can't remember the name
the characters are one women & man both are in university, the girls is a tomboy who is has abs and short hair, the guy is very muscular and bald if memory serves.
Story beats go like this:
the girl stops by her friends place on her way home from the gym to hang out, and when the guy goes to get the 2 a drink she goes looking for his porn collection & she finds it but is shocked to find out his kink is muscular girl with abs and shes so taken a back she doesn't notice him come back.
after talking she learns he got his kink from her and after some foreplay where she pulls his head into her abs the 2 hook up.
after that the 2 realize how much time has passed and the girl calls her mom to say shes on her way home only for her mom to tell her the their 2 families had wanted the 2 to be together and figure out through context the 2 just hooked up and just tells the girl to stay the night at his place which she does.