This is giving me flashbacks to a manga I read years ago. Teacher bottom, student top, and...

This is like every other yaoi manga do u remember the hair color or some other specifics?

I honestly don't remember what they looked like, my memory sucks. All I remember is that the student blackmailed the teacher.

I suddenly remembered something, there was a beach scene where they were doing it in the water while other students were swimming nearby

do u get the title?