Black Blood

Zayn has some issues. And they branch out further than the fact that he is a werewolf. To start with, his girlfriend doesn't know, he looks at family problems and to top it all off, a dosage of black blood.
Then Scar, the girlfriend, gets dragged into it, and when the both of them make trouble, they find themselves standing waist deep in hot water. And all because of some black blood, another blood bath begins. And you're in the middle of it.