You drove him insane. It wasn't slow; he didn't slowly lose his sanity, his grip on reality. No, for him, it was immediate. You walked into his life, and just like that, he let you control him, use him. He let you do whatever you wanted with him, and he happily complied. You aren't a curse, you're something else. A demon, perhaps, or maybe an angel, he can't quite tell.

Something about you made him compliant. He called it love at first sight when someone asked him why he listened to you, just before he executed them. A demon for sure. No wait. You treat him so gently, talking of purity, of power, natural power. So, an angel. No. He argues with himself in his head.

No matter what you are he's already done too much, sacrificed enough of himself to be yours forever. He's not upset, he's content, he's happy. He might be in love, he might be attached. It doesn't matter because as long as he does your bidding, he gets your attention. He'll do whatever you want as long as you stay happy with him.