Can't remember the name of the yaoi. The seme is the delinquent type and makes a joking suggestion to cheat on a test in front of the ML use who is worried about keeping his grades (I think for a scholarship) and the seme blackmails him about it and has a sexul relationship with him. They eventually develop feelings for each other and go out for real. It's a long series. Please help find name. I've been scouring the search engine.

it's the manga Don't be cruel
https://www.mangaupdates.com/series/hkd2hi4/hidoku-shinai-de

.★.