I've only played the game, and it was like a decade ago at that, but maybe Kichiku Megane? https://www.mangago.zone/read-manga/kichiku_megane/
Thank you for helping, but unfortunately it was more recent. I think i remember the author writing about how they intentionally wanted to make the seme an asshole.
The seme also blackmails the uke to do his bidding sort of vibe
Found it it’s caled gaps
It’s a manga where one of the MLs sort of acts like an asshole (has blonde hair and glasses) and the other ML has black hair and he goes along with it. They’re coworkers and I remember a chapter where they were driving together and the blonde seme acts out and is sort of an asshole.