I sincerely don't understand the story and the seme, he was about to get married and got t...

I sincerely don't understand the story and the seme, he was about to get married and got tricked by his fiance then the uke decided stupidly to comfort him with sex and suddenly the "betrayed guy" in a day is in love with him, super persistent, possessive and jealous, he doesn't give a f*ck what the uke wants and he decided that they're gonna be a couple. ┑(￣Д ￣)┍