His Human Claim by Stella Rising

After she is caught aiding a fugitive, twenty-four-year-old Darcy Lovell is given the chance to avoid prison if she agrees to work undercover to help track down criminals. But Darcy will not escape punishment entirely… She must now answer to Amasu, a stern, handsome Dominar operative who will not hesitate to strip her bare and spank her soundly for any hint of defiance.
It isn’t long before Darcy finds herself naked and bound with her sore bottom on humiliating display, but even with her cheeks blushing and her backside burning her helpless arousal is undeniable, and soon she is begging shamefully for Amasu to take her hard and thoroughly.
As he masters her body ever more completely, using and enjoying her in any way he pleases, their need for one another only grows stronger. But when one of the targets of his investigation comes after Darcy, can Amasu protect the beautiful, feisty human he has claimed as his own?