No Rest for the Wicked by Kresley Cole

Centuries ago, Sebastian Wroth was turned into a vampire—a nightmare in his mind—against his will. Burdened with hatred and alone for ages, he sees little reason to live. Until an exquisite, fey creature comes to kill him, inadvertently saving him instead. When Kaderin the Cold Hearted lost her two beloved sisters to a vampire attack long ago, a benevolent force deadened her sorrow—accidentally extinguishing all of her emotions. Yet whenever she encounters Sebastian, her feelings—particularly lust—emerge multiplied. For the first time, she’s unable to complete a kill… Read more.