Though Kellan Felix is a military commander not known for his soft side, when he sees Brianna in one of his interrogation rooms naked, vulnerable, and on display, he is all but overwhelmed by an intense need to comfort and protect the beautiful little human. But before he can take Brianna in his arms and claim her as his own, he must learn the truth about her presence on his planet, even if that means spanking her bare bottom hard and thoroughly until she learns to obey. As a lawyer used to fighting her battles in a courtroom, Brianna is utterly unprepared to be thrust into the midst of a bitter conflict on a far-off world, but in spite of everything her body's reaction to Kellan's bold dominance cannot be denied, and she soon finds herself writhing in ecstasy as the huge, handsome alien warlord brings her to one helpless, shattering climax after another. The situation becomes more complicated, however, when an ancient being takes an interest in Brianna. To confront this threat to the woman he has already grown to love, Kellan must enlist the aid of an old ally with powerful abilities of his own, but will the two men end up fighting over Brianna or sharing both her body and her heart? Publisher's Note: Mastering Their Human is the fourth book of the Captives of Stilox series. It includes spankings and sexual scenes. If such material offends you, please don't buy this book. Also note that an earlier version of this book was previously released by another publisher with the title Specter.