Wild Kingdom by Deanna Ashford
'Sarin was infuriated by his own weakness, knowing he could not fight her forever and fearing that one day soon his resolve would give way. Uselessly, he pulled at the chain that held his wrists together, knowing full well his bonds were far stronger than his own self-willed determination. "Come to my bedchamber, slave," he heard Danara say.' Salacious cruelties abound as war rages in the mythical kingdom of Kabra. Prince Tarn is struggling to drive out the invading army while his betrothed - the beautiful Rianna - has fled the fighting with the mysterious Baroness Crissana. But the baroness is a fearsome and depraved woman, and once they're out of the danger zone she takes Rianna prisoner. Her plan is to present her as a plaything to her warlord half-brother, Ragnor. In order to rescue his sweetheart, Prince Tarn needs to join forces with his old enemy, Sarin, whose capacity for perverse delights knows no civilised bounds.