Kare no Shouzou

Main story: Not-so-prodigal son Natsuki, who's mother is a famous artist, comes home to get some cash (or something that he can sell), only to get caught and mistaken for a robber by a stranger in his own home. It turns out that the stranger is a student/assistant artist named Asou, that Natsuki's mother has allowed to lodge in their house. Asou seems like a polite, delicate flower and Natsuki enjoys picking on him. One night, Natsuki takes a trip to an infamous gay bar and sees Asou there. Asou...