Okay I have been searching for a manga but the story is, the uke joins the swim club to be...

Okay I have been searching for a manga but the story is, the uke joins the swim club to be close to the guy he like (seme) but he keeps getting a hard on whenever he sees the seme so his resultion is to quit the team but the seem doesn't allow it (or something like that) and they have sex in the locker room. Please help me find it!