Draxton's Destiny - Edgeworld Chronicles, #2

Two years. Of incarceration. Of torture. Of hell. Sgt. Draxton Larimore knew the punishment for helping Subject 5691 escape Alliance control would be great, but he hadn't expected it to end with a sale on a Den'Lastrian slave market. Forced to reject the help of the experiment he once saved, Draxton's sold and shipped off to distant Seshinaar as a gift and a pawn in a lethal game. Kasseus Minshaar has a secret.
It lies in the power coursing through his blood and in the love for his people. A secret his fellow chieftains would kill to suppress. So when his cousin presents him with a gift in the form of a human soldier, a gift he can't reject or risk war, he's determined to set the male free immediately. He knows the inhumanity of slavery and won't tolerate it in his territory. As they fight their growing attraction, Draxton and Kasseus unearth a larger plot which threatens to undo all Draxton fought to save and spell the end to Seshinaar forever.
Failure isn't an option when success means a future wrapped in each other's arms.