Do you know any manga where the seme used to sleep around, but after meeting the uke, he became completely devoted to him?
https://www.mangago.me/read-manga/mukoiri_alpha_wa_ai_shiru/
another one is waterside night. didnt finish it bc it was bit too triggering for me but from what ive heard, he became an absolute househusband by the end
Both of them are such green flags! I love the story!!!