who remember this one yaoinwhere the uke and seme is already in a relationship but the seme has a hostile relationship with his own brother who is a teacher at the school where he and his byfriend is attending and turns out he actually had a crush on his ownbrother hence the hostile relationship to cover that up
May be this ? -
https://www.mangago.me/read-manga/boku_no_kareshi_no_sukinahito/
Im on chapter 54 but THE POLICE AND THE TWO need to team up likeee i know the law the police can use the two to catch the bigger guys like COME ONNNN