Tie Me Down by Cynthia Rayne

Know when you are beaten
Flash is a former Navy SEAL with many burdens. The women in his life have a way of ending up six feet under. First his sister, and then his client, two women he failed to protect. For once, Flash is sick of running. He longs to be punished for his misdeeds.
Taming the Dominatrix
Sage is a domme, working at a local Kentucky sex club. Men pay for the privilege of bowing down before her and she doles out penance, not pleasure. Flash wants Sage to discipline him, too. But she finds herself drawn to Flash. He’s holding on to a lot of pain and guilt, and she wants to set him free.

Pushing Boundaries
The fine line between personal and professional gets really blurry. Flash is an alpha male, the kind of man she usually avoids, and he’s pushing her boundaries, urging her to submit to him. But can she let go?
And what happens when a client becomes obsessed with her? Will Flash keep Sage alive, even though he’s failed before?