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i remember that the Seme is a demon i think, hes huge and he can hide in the Uke shadow, he think he's ugly but he's adorable and the Uke is a middle age man, but he's very seductive and like to sleep around, this is a manga.
This is what you're looking for i think http://www.mangago.zone/read-manga/the_monster_and_the_beast/
is this the story where the MC is just going to be a cupid of sort for ML ? or will he turn into a human later and establish an actual loveline with ML i wonder
Chances of mc not ending up with ml are looking very very low based on my reading experience.
I'm pretty sure MC gonna be in love line with ml given how he actually changed to a human in chapter 20-ish