Dangerous Deviance by Audrey Rush

Her fate is in my hands.

Ellie showed up on our family’s property vulnerable, alone, and without any memories.
Trespassing in mafia territory should have resulted in her death. But on my birthday, she became my gift—to use, to mold, to break. She owes me her life. Until the day she dies, she is mine.
As her secrets unraveled, it became clear that one of our enemies sent her. I should have killed her right then and there. But Ellie was a mystery, and like a moth to a flame, she lured me in.
Then she learned who I truly was.
We couldn’t resist the urge to destroy each other. And I knew it would ruin us.
For what could be more reckless than falling for a dangerous woman?