For the Heart of Daria (The Prendarian Chronicles, #2)

A human who's lived under alien domination for her entire life, Daria vows to rid Earth of the evil invaders no matter what the cost--even if it means seducing a powerful alien sympathizer. Stunningly handsome, irresistibly charming, Gray isn't the monster she wants him to be. He saves her life...and gives her more pleasure than she ever imagined. But despite the passion he forces her to feel, she can't sacrifice her mission--and she can't tell him who she really is. He's a collaborator, and nothing will ever convince her to trust him. She hates his people. He hates her prejudice. They don't understand each other, but they want each other with a passion that defies all reason. And with a desperate mission of his own on the line, Gray will do whatever it takes to win the heart of Daria.