Robin is such a bastard. The carnivore was starving and persecuted and begged him for help so he made him his sex slave. And then made him participate in BDSM so he could take out his hate against carnivores. So now the uke is attached to him because Stockholm Syndrome and what? We are supposed to believe they have a lovey dovey ending. Or that Robin is actually just a cute tsundere? Fuck that.