Please help, I'm looking for this yaoi manga..

This is set in high school (there are multiple couples) they are roommates, the main couple's seme has black hair and wears glasses and he's a hentai artist and the uke is someone who has trouble getting to school on time because he's easily sexually aroused. The uke was molested on a train before and now he's an extremely horny person... The seme, his roommate, finds out about this and decides to cure him.. ("Cure".) if you know what I mean.