Another try for old plot
Timing - a long time ago, Prowl and Jazz only started their careers. Prowl is much more open, even little dreamy mech. And he has attraction to social butterfly Jazz, but just to shy in this kind of stuff and don’t say a word about it. Once, after celebrating of victory over decepticons/cibertronium holiday/etc. totally drunk Jazz offer Prowl “to have some fun” and young tactician accept it like his chance to confess his feelings to saboteur. But the next morning Prowl find his lover with someone else and seems like Jazz don’t pay attention to the previous one night stand at all. Maybe Prowl even gets sparked after it. It’s real shock for Prowl and he promise himself never coming close to Jazz, maybe goes to other base. Many years later they cross again and as time is going on it’s saboteur who starts to seek Prowl’s attention…