His to Claim - Titans Quarter, #1

It was only supposed to be a weekend fling.After a broken heart, Hannah Mills vowed never to offer more than her body to any Dom, but when she volunteers to be the prize at a slave auction benefiting charity, mysterious philanthropist and notorious playboy Mason Sullivan tests her resolve. The moment he sees Hannah, Mason is captivated and determined to have her-at least for a weekend. For Hannah, being claimed by Master Mason is both a dream and a nightmare.
He's devastatingly sexy, far more complicated than she imagined, and he's relentless when it comes to scaling the fortress around her damaged heart. No matter how hard she resists, layer by layer, he manages to tear down her walls. When their time together draws to a close, Hannah must choose between saving her soul or risking her fragile heart to a man who demands forever.