Bound to the bed, a trembling sub awaits her Mistress' mercy. She enters, riding crop in hand, a sadistic smile playing on her lips. She teases his erect cock with her tongue, then brutally spanks his balls. He howls, but she silences him with a savage thrust into his aching pussy, fucking him ruthlessly, her hips slamming against his, leaving him a quivering, sweaty mess.