The siblings huddle together in the darkness, their bodies pressed close for warmth. She shivers, her nipples hardening against his chest. He wraps his arms around her, his hands wandering, exploring. She gasps as he finds her wetness, his fingers slipping inside her. Their bodies move together, their breaths ragged, their hearts pounding. They're lost in their own world, their bodies connected, their souls intertwined, as they chase their pleasure in the darkness.