Just another case of want and rape... the younger sibling just gave up his bf to the elder sibling under the pretense of getting him back on the good side of their family or something I dont really remember the cause anymore, but its not important because the elder is just gonna shove him in shit and not keep his end of the bargain.
The dickwad senior bro just wanted to have the guy, like a child a toy in the store, did all this shit but is later gonna be praised as a hero for saving the bottom from his evil shithead little brother that had some evil plan and not actually caring about the bottom or some bullshit and senior ends up with the bottom (the bottoms reason being: *after revealing some generic sad backstory* he is so pitiful,despite all the shit he did to me, he likes me)
They're really gonna use every trope in this one hahah not that I mind