Dark Sentinel. Netherworld, #1

Their love could give him a second chance at life-or condemn her to an eternity of damnation. Yanked from his tortured existence in Netherworld and dumped naked in the Louisiana Bayou, Lash could swear he's died and gone to heaven. Except for the fact that a millennium ago he died a condemned soul, forever barred from Paradise. His new life feels like the next best thing, full of small miracles. Like silence.
And ice water. And the company of a beautiful, compassionate woman. Teva is a woman with a taste for heavy metal music, an inherited talent for magic, and a trusting heart. She knows nothing about the mysterious stranger she's taken in, only that he needs her help. And the fact that he's gorgeous hasn't escaped her attention. She can't see Lash as anything other than a sexy, gentle man who soothes her nightmares away.
Then Lash learns the real reason for his reprieve from Netherworld: he's been sent to corrupt Teva's soul with sinful pleasures. Starved for tenderness and aching with desire, Lash yearns to accept the loving embrace Teva offers. But he can't give in to passion without condemning her to the horrors of Netherworld. The ultimate battle between good and evil is brewing, and Lash stands between Teva, who owns his heart, and Satan, who owns his soul.