The Suckula Trilogy
by Jenni Ambrose
Beatrice lures Eric, an unsuspecting human, into her castle in the mountains of Romania. Seducing him, she transforms him, and they embark on their sexually charged lives as vampires with their familiars, one of whom is brought into their fold after Eric's transformation. Finally, a vampire hunter enters the castle, only to find himself up against Eric, his familiar, and two hard cocks.