His to Claim by Sierra Cartwright

It was only supposed to be a weekend fling…but what will she do when he demands forever?

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 benefitting charity, mysterious philanthropist and notorious playboy Mason Sullivan tests her resolve. The moment he sees Hannah, he’s 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 relentless when it comes to scaling the walls around her heart. No matter how she resists, layer by layer, he manages to peel her open.

When their time together draws to a close, Hannah must choose between saving her soul or risking her heart.