The slave is strapped down to the bondage rack and has a spiked cock ring attached to his flaccid penis, such that the more Mistress Serena gets him aroused, the more CBT suffering he must endure! She spits in his mouth, grinds her pussy and her ass in his face, then rubs his cock with her soft black leather gloves... all of which makes his cock throb out of extreme pleasure and simultaneous excruciating pain!