Bound (narry au)

     Everybody is born with some sort of mark. Some of shapes others of animals, it could be anything that represented the person. They were like tattoos, only they are born with, but only half of it is on their skin. The other half is on the body of their fated partner. Once fated partners meet for the first times their marks starts glowing and the pair become inseparable. They are then bound together for the rest of their lives. It's no secret that the vampires and werewolves hate each other with a burning passion. But what happens when Niall and Harry find out that they're bound together? That they can't live without each other? That they're madly in love? Will they be accepted or will the fact that Harry is a vampire and Niall is a were-wolf become an obstacle they have to overcome.
WARNING: Will contain a lot smut, like a lot. Enjoy!