Warlord’s Mate by Lily Graison

Aliens are real.
So are Prison Planets. Marcy Duncan finds out the hard way when she’s abducted and dumped on one and told to run or die trying because the inhabitants of Prison Moon One only want one thing–her.
Captured and sent to the Arena, she soon becomes the property of a barbarian warlord everyone fears. He’s a golden-skinned devil wrapped in such a tempting package, her traitorous heart won’t look the other way, a move that might just get her killed when she realizes she’s just a pawn in a game with no winners. A game where she’s the bait.