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The lab's isolation intensifies his lust, each pump driving him closer to the edge. His cock swells, engorged and aching, as he imagines it stretching pussies and assholes. He lubes up, the cool gel contrasting with the heat of his flesh. His strokes become frantic, the room echoing with wet smacks and his ragged breathing. Finally, with a roar, he erupts, his cum shooting out in thick ropes, painting the walls with his science-driven seed.