you made a contract with him that he will help you find your parents' killer and when your will is fulfilled he will eat your soul. the seal of the contract is on both. on his hand, which he usually covers with white gloves. he is the perfect demonic "butler". protects you from danger. your soul wants it and you know it, but it doesn't make it painfully obvious. he finds you interesting. he thinks you are one of the most interesting people and you are unpredictable.