The Vampyren Invaders4 books in series
Taken by the Vampyren Publisher's Summary
He was a conqueror. A warrior come to Earth to kill. On his own planet he was a prince. On Earth he was a murderer. On Earth, he was her owner. But Cassi's no passive, frightened girl. She stands up to him the first time she ever sees him. She's going to stand up to the Vampyren every time. Even if it kills her. But neither of them is quite what they seem.
Maybe, what fate has sown together shouldn't be torn apart.