I never managed to read the entire manga but it's a story about a teacher and a student. When the student was younger the teacher tried to abuse of him but the boy managed to escape hitting the teacher with a stone. When the boy grows old he become a disturbed young man who accepts to have sex with any person in his university and developed a obsession about the teacher who tried to molest him (he wants to conquer that teacher at no cost).
I have no idea where this story goes because I read only the first chapter. Any help is greatly appreciated.

Zange - A Confession of His Own Guilty
Story of a high-school student who was sexually assaulted when young, and grew up to be openly homosexual. He always tries to antagonise a teacher whom he doesn't see eye to eye...

It's this one, thank you so much 🙂