The slave's mouth is filled with his mistress's piss, warm and bitter, as she reliefs herself onto his face. She grinds her ass onto his mouth, smothering him, her hands gripping his hair tightly. "Drink, slave," she commands, "drink every drop." He swallows, choking back his gag reflex, his own cock throbbing in his cage. She laughs, a harsh, satisfied sound, as she wipes her ass on his face, leaving him dripping and humiliated. "Good slave," she purrs, "you please me."