Looking for a bl I read, I remember there was a side story withinn the book that was about...

Looking for a bl I read, I remember there was a side story withinn the book that was about this guy who liked this other guy, but didn’t know how to tell him his feelings so he pretended to like another guy and asked the guy he liked if he could use him as kissing practice. The guy held himself back a grade just so he could be with the guy he liked(he saw him at a martial arts competition) and he pretended to like the president(?) of the martial arts club. The guy was super cute tho so... HELP ME FIND IT ╥﹏╥