A writhing, bound captive is introduced to the dark arts of BDSM by her merciless mistress. Her asshole is violated by a relentless succession of dildos, each one thicker and more punishing than the last. The mistress' whip sings through the air, marking the submissive's flesh with cruel red welts. As the final, monstrous dildo is forced into her ass, the submissive screams in agonized ecstasy, her body convulsing in a messy, humiliating orgasm.