Okay so the teacher is an uke and his student like abuses him and the teacher calls him a monster or something? then he finds out the student was abused or something? idk.

I remember the student also fell in love with the teacher before (when he was like a kid) and thought he was a girl, cause the teacher was kinda forced to dress up for a festival I think.

The main thing I remember is the student (the seme) is really verbally abusive and says things like "oh you're a slut, you want to be held like a woman" during sex. and it's kind of sad at first but it has a happy ending.

Looks like Hitomi no Honne or maybe Hitomi no Giwaku by Asagiri Yu..

Sekai wa minikuidesu..shika shi! Yūjō, yūki, tsuyo-sa wa ikinokoranakereba narimasen..Tiruendo!