https://www.mangago.zone/read-manga/love_trap_official/ its a bit of a nothing burger but u should give it a try incase u like it
The rogue prince is secretly an omega - Prince x Knight and political rival/childhood friend
Turning - (Technically not what you asked for but) Knight x Knight Commander
Moonlight/Lunacy - Knight x Prince, the knight is the uke and it seems fairly toxic from what we know so far
Bloody Moon - Prince (or maybe king?? low key can't remember) x Assassin/Commoner
Could try King's Maker. Prince x secretary/companion (kinda forgot tbh). There's a shounen ai and a mature version!
The title is "King's Maker", just realized how I posted it might be confusing.
any prince (or similar titles) x knight/ commoner/ butler bl recs?