So, this was a very sexy omegaverse but I kinda dislike slutty ukes. I mean, the uke REPEATEDLY fucks several guys after meeting the seme. I mean, yeah, they weren't a couple or anything at the time but it's a preference thing. I dislike one person in a couple fucking other people after meeting the person they fall for, period. I get it though, instead of being "woe is me" about his lot in life he's using what he can to his advantage. And the story ends pretty sweetly. I particularly like it when the uke gets jealous.
Kurui Naku No Wa Boku No Ban