The femdom's voice echoes through the room, "Are you ready to serve your mistress?" The sub nods eagerly, his balls already aching in anticipation. She mounts him, facing away, her ass pressing against his face as she rides his cock. He groans, the sensation overwhelming, his face buried in her cheeks. She reaches back, grabbing his balls again, this time pulling them upward, stretching them painfully. She cackles, "You like that, don't you, my pet?" Before he can respond, she releases his balls, slapping them hard, leaving him panting and yearning for more.