Underworld: Rise of the Lycans

The third movie in the Underworld franchise is actually a prequel, showing how the two races of vampires and werewolves came to be mortal enemies. Set in the household of a vampire, a pet werewolf falls in love with his master's daughter, and they get their groove on. Daddy is not impressed, and has the werewolf punished and imprisoned. The werewolf escapes and leads a revolution, but his love forces him to return to rescue her, putting himself in danger again ...