Tail of the Devil — Danielle Devor

If Mathias thought being homeless sucked, being a vampire is worse. The vampires who transformed him believe he is the reincarnation of an ancient king. They expect him to quit swearing, use a napkin, and play by their weird, ancient rules. Screw that. But after the reigning queen assaults Mathias, he has visions of a past life in which he was that king. Turns out the current queen killed him then, and wants to kill him again. He'd better grow up fast, because if he doesn't his second life may be shorter than his first.