Valefar — H.M. Ward

It's 369 days before Ivy loses her soul to a demon kiss. Collin Smith, the most powerful Valefar this side of Hell, wants his soul back. He thinks he'll get it too, until a bargain with a powerful demon proves to be more costly than he hoped. As his world shifts, Collin tries to protect Ivy, but he knows he can't be with her. Torn between his affection for the girl and his loyalty, Collin is forced to be the evil creature he tries so hard to deny... A Valefar.