Uwasa no Futari (MEGU Iroha)

From Yaoi Is Life:
Hebikui Tori
One night in the city, Nijou comes across a man having sex with another man. The next day at school, he runs into that same man, named Chitori, and learns that he's a member of the staff. Nijou can't help but become intrigued by this man who appears to lead two lives - by day, a regular guy on campus; by night, a minx who likes to take it from men in the city. When Chitori drops by his part-time job and they get to talking, Nijou finds himself desiring the other man and becoming attracted to him. It becomes an obsession that he can't shake...

From Canis Major Scanlations:
Uwasa no Futari
Mouri and Yura's friendship is plagued by constant rumors, the most famous one being "They are a couple". One day, when a girl asks Mouri out, the school spreads a rumor that they had a one-night stand; Yura gets jealous, and kisses Mouri in order to make one of their rumors true that they have kissed. Will Mouri ever realize Yura's feelings for him? Will they be able to regain the comfortable friendship they once shared or will it fall apart?