The siblings, driven by primal urges, surrender to their mutual desire. The brother, his cock throbbing with need, watches as his sister, legs spread wide, fingers buried deep in her slick cunt, bucks against her hand. She moans, her voice low and guttural, her eyes locked onto his rigid length. He can't resist any longer, and with a growl, he joins her, stroking his cock furiously, his body tensing as he spills his load onto the floor. She watches, her own body still trembling with aftershocks, their shared lust hanging heavy in the air.