Responses
I haven't read the novel yet but someonw commented this spoiler
Apparently, Ain (uke) was a servant of the Anatold's before (seme's family) and was raped by Seme's dad or something like that. He's basically pretending to be a servant right now to take revenge to the seme's family by taking their youngest son.
(I'll try to find a good translation so I can read the novel.)

So far I have heard that the bottom is crazy toxic and deranged BUT I have yet to see why??? He plans to kill the seme as revenge for being sexually exploited but that's not particularly crazy??!!!
So someone please give more details to the plot, I really don't mind major plot twists being spoilt