Title

I read a manga looong time ago and just can't remember the title.
There was a little black haired boy who spent a lot of time at a college student's apartment and he was slowly taking advantage of the boy (first he was just kissing him and then he was touching him) and the boy started to ask questions about sex (also at home and his parents have become suspicious). And then one day the student wanted to have sex with the boy and he ran away (I think parents pressed charges against him). Then skip forward some years (the boy is now a college student) and he can't forget his "raper" and feels guilty and is in love with him and one day he finds him and the guy records their sex and uses it to keep the boy for himself once again (I think they have a bit of bdsm style going around but I'm not sure) (I also think that the boy's girl friend once tells him how this guy was raped by her father).
Pleaseee help me find this mangaaa!!!