Unholy Pursuits — Suzanne Rock

Book 1 in the Immoral Hungers series. Darien let his guard down once, and Arianne stole the demon stone from under his nose. Now he has to get it back, no matter what the cost. It doesn't matter that the feisty redhead calms the voices in his head, or that her body tempts him beyond reason. Only the stone will ensure his survival. He decides to appeal to her feminine side and use gentle seduction to get it back. As he begins, something inside him changes and the voices in his head compel him to use pain to heighten desire. As Darien's touch turns dark, Arianne's lust escalates and a connection forms between them. Yet despite her need, she can't let the sexy FBI agent have what he wants. If placed in the wrong hands, the stone would release an unholy force intent on destroying everything she loves-including Darien. If only he wasn't so persuasive...