Taken By the Renegade by Sadie Marks

Samantha is a masochist with no interest in the trappings of romance or submission, until she meets the sexy new Dominant in town and falls for him hard. But he’s not who she thought he was. He’s not even human.

Trev is a renegade member of the sadistic Sadec race and by the time she learns it, she’s on his spaceship far from home. When she’s confiscated by his people as forbidden contraband, Sam finds herself reborn into her new life as Silla. She consents to fill her role as Pain Receiver and reluctantly learns to submit to their whims.
But Trev is never far from her mind, and when she’s given the chance to get back to her renegade Sadec Dom, she realizes it’s worth risking everything to be with him.