Surrendered: Book 20 in the Brides of the Kindred Alien Warrior Curvy Heroine Science Fiction BDSM Romance series

Commander Thornex is a Hybrid--half Kindred and half Pyro--a much feared people who have the ability to unleash horrific maelstroms of flame whenever they are angered. All his life Thorn has struggled to control the destructive power within him. A horrible accident in his past made him swear to never unleash the fire again and for many years, he has kept himself under tight control. During his many undercover missions as a spy for the Kindred, his iron will has never wavered.
That is until he allows himself to be sold as a slave on Yonnie Six

Mistress Neh'sanna is the most renowned trainer of male body-slaves in all of Yonnie Six. The denizens of the female-ruled society revere her effortless control and the way she is able to make any male bend to her will. But though Neh'sa takes pride in her work, she is lonely. She trains male slaves for the use of other mistresses but has never found one of her own that she could truly let down her guard around. Then she buys Thorn and begins to have feelings for him no Mistress ought to have for her slave

The emotion between them grows intense but when circumstances spin out of control and Thorn is forced to reverse their positions and take the role of Dom, will Neh'sa ever forgive him? You'll have to read Surrendered to find out...