Mitsuka, Volume 1 (manga)

Leo is host at a nightclub, and he always thought he had no interest in men — until he slept with Takahiro, a sex worker who introduced him to pleasures he'd never felt before. Now, sex with women doesn’t satisfy him, and after begging Takahiro to sleep with him again, they agree to a “friends with benefits” arrangement.

But just when Leo thinks he may be falling in love, one of his best customers asks him to sleep with her. Takahiro catches him in the act, and things take a dark turn…