Responses
Right, nvm, found it
https://www.mangago.zone/read-manga/houkago_no_love_call/
https://www.mangago.zone/read-manga/hatsujou/ this is the one I immediately thought of
wait nvm it's the student's father x sensei xD sorry fhdhhehsjs
I've alreay read this yaoi before but I can't find it on my read list. Basically it's about a high school teacher who has a problematic student. This student's father is a yakuza, who took a liking to sensei. That's as far as I remember ╥﹏╥ Please help. Thaaaanks!