The siblings huddle together in the cramped space, their bodies pressed close for warmth. The brother's hands tremble as he reaches out to touch his sister's face, his fingertips tracing the curve of her cheek. She leans into his touch, her eyes fluttering closed. He can feel her heart pounding in her chest, matching the rhythm of his own. Slowly, his hand moves down, cupping her breast through her thin nightgown. Her nipple hardens at his touch, and she lets out a soft moan. He swallows hard, his cock stirring in his pajama pants. She reaches down, her small hand wrapping around his length through the fabric. He groans, his hips bucking slightly. They're playing with fire, they know, but they can't stop. They're drawn to each other like moths to a flame, their bodies aching with a need they don't understand but can't resist. They strip each other bare, their bodies coming together in a passionate, forbidden dance.