This manga has multiple stories. the first story is about these two friends that grew up together and the blonde one has a pure hatred from homosexuals. Obviously, since this is a BL, his best friend has been in love with him for a while. They become a cute couple and I think they confess in a train station.
the second story is the one with his stepbrother moving in with him after they've grown up and the guy is in debt because he keeps paying for sex. now, obviously the solution for this problem is to fuck you bro, right? like, what are siblings for???
Finally, the third story is about a new student that comes into the class that is a delinquent. He recognizes his old friend and piano partner who he has loved ever since they met. the delinquent kisses him and they both get swept up at the moment and end up dating.
Abarenbou Kareshi