I'm kinda jelly that you feel he's the worst of the worst
How cute!
There is something about it that bothers me the most. I've read over 7000 manga of all genres and sometimes, stories stand out to me for a reason that might not be obvious to someone else. To me, there is something so sinister about a guy whose abuse just increases regardless of the reaction they get. Not that abusers are reasonable to begin with but they sometimes can be appeased by apparent obedience...
This might truly be one of the most abusive MLs I've ever seen. I've seen so many stories that contain violent rape scenes but never have I ever seen an ML that breaks MC to this extent where he truly is losing his mind. What makes me sick the most is the fact that MC bends to ML's every whim and does everything to appease him but the abuse only gets worse.