looking for ....

I am looking for a yaoi Manga, it's teacher (seme) x student (uke). Trough some circumstances they have a physical relationship. As the Student graduates he asks for the teachers wrist watch as memento. Then some years later they meet again at class reunion where the teacher thinks it would be fun to pick up their previous relationship, but it doesn't go he'd planned.

Sorry for the Bad description... also, thanks in advance~