rou's Favorite

So this was this bl and there was this part where one of them (uke?) was kissing the seme a lot and it turns out he was like addicted to his kisses cause of nicotine in his mouth. Can someone please tell what story this is from?

any bl abt serious black haired ukes? (buisness type etc) like shin from kings maker?

Uke is a masochist. He got Isekai(?) Into a story where he became a secretary of a sadistic boss