Lord of the Vampires (Royal House of Shadows, #1)

"Nicolai the Vampire was renowned for his virility, but in a twist of fate "The Dark Seducer" had become a sex slave in the kingdom of Delfina--stripped of his precious timepiece and his memory. ... In her dreams, a wanton vampire called to Jane Parker, drawing her to his dark sexuality and his magical realm. But for a human, all was not a fairy tale in Delfina. Jane was the key to Nicolai's memory--but exploiting her meant dooming the only mortal he craved"--Page 4 of cover