Slave to the Alien Prince by Maia Tanith

This prince has lived his whole life bowing down to others. It might just be a slave girl who teaches him how to stand tall.

Faye thought she had finally made it to safety. Spoiler – nope, she hasn’t.
Her life on the run was going to end, and she was going to make it across the border into America. Instead, she’s abducted by alien slavers and sold as the personal slave of a pampered prince in a planet very foreign to that of Earth.
But there might just be more to the prince than his spoiled, selfish façade. So much more that Faye might just be about to risk her life again, this time for a cause much bigger than she could have ever imagined.
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Khan’s hatred for the life of court runs deep. His hatred for the Emperor, his Uncle, runs deeper still. If there was a way out, he’d leave.
But while he might feign indifference to the suffering of the empire, inside he knows that if he leaves, those he loves will suffer even more. So he stays.
Until the appearance of his new Earthling slave. She might have been sent to spy on him, but it’s getting hard to keep his distance from her. And when the unthinkable happens, it might just be his slave who holds the keys to his own redemption, and to the future of the planet.