the seme had no intention of being a seme in the first place. he's just a straight guy who prefers old women and was offered sex by the uke (quid pro quo basically)
also quid pro quo means "something given in return for something else" basically uke asking for sex so that the seme could give them another shot for the project, and that is something the seme hates.
in conclusion, i dont think the seme is an ass and he doesn't like the uke at all (but in the future for sure)
Is the seme just an ass? Or an ass that likes the uke?