A slave's world revolves around their Mistress's ass. They are bound and helpless, yet enraptured, as she presents her posterior for their adoration. The slave's tongue explores every curve, every crevice, reveling in the taboo taste of ass worship. The Mistress, cruel and dominant, rides the slave's face, using them for her pleasure. She grinds her ass onto their mouth, smothering them, before turning around to sit on their face, her asshole and pussy taking turns to engulf the slave's tongue in a degrading, yet exhilarating, face-sitting session.