Adam no Junjou

Kazuma is a shy high-schooler who happens to be gay, and in love with a popular and handsome, Ayase. A while later, Ayase befriends Kazuma, having found out that Kazuma is gay, and admits that he too is gay, and convinces Kazuma to go out with him. Yet all Ayase does is have sex with Kazuma, causing Kazuma to feel insecure, are they dating or are they just sex buddies?