Trying to find a yaoi where it covers two couples. The first couple are some classmates (...

Trying to find a yaoi where it covers two couples.
The first couple are some classmates (I think) and the seme has an older brother that teases the uke as well.
Eventually older brother is walking and literally (his future uke) yeets a dude onto him. Turns out uke is really strong and even has a tendency to like dislocate big bros shoulder during sex. (This leads to an attempt at tying his hands up and I think they even tried to seperate cause uke was sad seme kept getting hurt)

One bit where the two ukes meet and try to make the seme jealous by having "sex" (was just fingering) and that kinda backfires
everyone ends up getting laid and I think the brothers are like "lesbian sex doesnt count as cheating"