Niki is a vampire that has a cross tattoo on his wrist his tattoo is not just a normal tattoo, it is his power, he can control anyone and do anything with it but he don't know that it can transfer to someone, he needs to hold the person's wrist (you) where his tattoo transferred.. but even if you has his tattoo you can't control it and only him can control it but he still have to hold your wrist to control it but he can't control you ..