Stockholm syndrome
I do not think brainwashing made him want to fuck his son. He was a bitch before but now he is worse.
No you're just a pathetic brain dead bitch caring only for seeing the mc fuck He's been tortured and manipulated for years did you not read or do you really think he does this happily without his mind having been fucked with if you saw the first scene with wren and that bastard you'd know he despised him and would never want to fuck him so knowing that he must've been through hell to get to this point
I think he may have like lost himself. He was torture for a very long time then made to depend on his torturer. His mental state may be just to be free of such pain. And he's brainwashed into thinking this is his only way out..
I'm not saying this is the true I'm just speculating.