Responses
I don't know if this is right but it's kinda similar to what you said:
http://www.mangago.me/read-manga/hatsukoi_encounter/?QXQc
beta
Yaoi manga where this black haired guy is into romance novels and movies, and then this other guy comes and makes him do something sexual on the first day. Later on the black haired guy sees him again but this time he joined the same club as him