Accidental Succubus: Everything's Shifting

Melody has been transformed into a succubus, and her vampire lover Julius is taking her to a friend of his that he's sure can help. When the friend turns out to be a beautiful lover of his named Lilah, and helping consists of Lilah letting Melody sleep with Lilah's partner Jonathan, who also happens to be a werewolf, things get complicated -- and very, very hot.