There are 3 roommates. 2of them are bisexual and most of the time they bring girls to house or do groupies. Sometimes they do it between themselves. Main character has problem with premature ejaculation. And he doesnt take part other two guys intimate life. He stays in his room. Also uke guy tells main character he will help him with his problem but he refuses. Hope i could explain what im looking for.

"3 1/2" by Sadahiro Mika?

Thank you very much ^^ thats the one))) actually my friend searching for it for a long time. I said i will help her. And you helped me. We both thank you.thanks again)))