what that one yaoi where the dom top is a student and the sub bottom is the professor

Are you talking about an actual dom/subverse genre? Or just that the bottom is the professor and the top is the student?

There’s this one that is just about regular BDSM? https://www.mangago.me/read-manga/river_of_bondage/

This? https://www.mangago.me/read-manga/caligula_no_koi/