Ok here u go:
Couple 1 (ch1 - ch26):
Uke has liked Seme since high school and Seme decided to "let him" kiss him and such. After Seme introduces Uke as "a person from school" to his new friends, Uke feels bad and while working on a school project he's assaulted by a classmate. Seme realises his feelings and saves Uke before he's raped, but Uke's still mad. Some drama happens and the couple talks it out and they date.
Couple 2 (ch26 - ch50):
Uke's brother works at a lingerie making (?) company and has a crush on his coworker. He becomes sex friends with a delivery man (who he has sex with while imagining the coworker). There's drama during which the coworker realises he likes the Uke, it's basically a love triangle for a while. Then the Uke chooses the coworker and they date.
Couple 3 (ch51 - not yet completed):
A friend of the delivery man meets a hot guy in a bar. They make a bet and whoever loses will be the bottom (the hot guy is afraid of being uke). The friend was raped in the past so hot guy feels bad and bottoms for him.
There's a fourth couple but I haven't bought those chapters as it's no longer sold on Lezhin ;-;
Hope this helped!
people who read this, please spoil it, i don't want to read another manga/hwa/hua that will make me dissatisfied.