In His Keeping by Maya Banks

Arial knows the rules that keep her safe. She's been following them since she was a little girl: Do not tell. Do not show. But in a moment of terror, facing an attacker intent on taking more than just her life, Ari has no choice but to unleash the psychic powers she's been hiding since childhood. Now, with her abilities revealed, a bigger threat looms - something that makes her question everything she thought she knew about her parents and her secretive upbringing. But this isn't a fight she can face on her own. As the head of Devereaux Security, Beau Devereaux is no stranger to the strange. But when he takes on a new client - a beautiful young woman with an extraordinary gift - Beau isn't prepared for the extent of his attraction to her. What began as a simple assignment, just another job, quickly turns personal as Beau discovers he'll do anything at all to protect Ari. No matter what it costs him personally. Even his heart and soul.