Responses
Was it this one? The top isn't blonde, but the plot is similar.
https://www.mangago.zone/read-manga/datte_maou_sama_wa_kare_ga_kirai/
yes it is tysm
the main character was a demon lord’s descendant (Maou I think) but it takes place in the modern day. He’s kinda a bum, has black hair. Basically the top is a blond guy whose job it is to subjugate the hero (it’s part of his bloodline as well) and he’s rougher and I think implied part of a criminal organization. They’re both in their thirties and it’s somewhat enemies to lovers.