The Darkest Kiss by Gena Showalter
She has tempted many men…but never found her equal. Until now. Though she has lived for centuries, Anya, goddess of anarchy, has never known pleasure. Until Lucien, the incarnation of death–a warrior eternally doomed to take souls to the hereafter. He draws her like no other. And Anya will risk anything to have him.
But when the merciless Lord of the Underworld is ordered by the gods to claim Anya herself, their uncontrollable attraction becomes an anguished pursuit. Now they must defeat the unconquerable forces that control them, before their thirst for one another demands a sacrifice of love beyond imagining…
Gena Showalter is a hit and miss author for me however this series gets better with every book. I thought that Madoox and Ashlyn were good together until Lucien and Anya. These two are the perfect match for each other. This is a book that I highly recommend.