The room echoes with wet, squelching sounds as the anonymous figure impales themselves on the massive bottle, their asshole gaping around the thick glass. They arch their back, taking it deeper, their body trembling with each thrust. The bottle disappears inside them, their ass cheeks clenching and releasing as they fuck themselves into a frenzy. They gasp, their body tensing as they reach their peak, their asshole pulsing around the bottle, marking it with their hot, sticky cum.