The Debt Collector by India Kells

A debt that she may not have the strength to repay.
Dr. Tessa Freeman is dedicated to the well-being of her patients, and when battered girls come into her ER, escaping from an underground slave ring, Tessa risks it all to save them. Unfortunately, no good deed ever goes unpunished.
Captured by the slave master, her fate seems worse than death, when a mysterious debt collector comes to her rescue. Locke is not what he seems, full of darkness and secrets, however, he agrees to offer her sanctuary if she repays her debt to him, by completely offering him her body.
Temptation is everywhere, and Locke plays with her mind by sharing her with his best friend Gage, when he’s not ravaging the fierce cage fighter himself. Lust and secrets blur her mind, making it difficult Tessa to know what she desires beyond the two men owning her body. The debt is hiding more than it appears and Tessa won’t be satisfied until she gets the truth. And the man she wants.