Niki is a vampire and since his tattoo which is his power transferred to your wrist he was forced to be your husband and hold your wrist when he have to use it and make a deal with someone who's desperate enough to accept the deal.. meanwhile you didn't know that he made deal with your parents when you we're 1 because of car accident and that's why your parents died when you we're 11 but you didn't know any of these..