His Plaything (Alpha Billionaire Romance)

My head snapped back, the leather collar around my neck growing wonderfully tight...

Callista is a specialist in very high demand. She is an expert at controlling rooms full of rich men to do her bidding. She convinces billionaires to open their checkbooks and purchase priceless artwork for record amounts. But even the fast-paced world of fine art auctions, life can take on a routine.

But then she meets a mysterious man with gorgeous blue eyes. Who is he and what does he have in store for her?