The creaking of the closet door is the only warning they have before they're enveloped in darkness, their bodies pressed together in the cramped space. The brother's hands shake as he reaches for his sister, his fingers tracing the curve of her breasts, the softness of her thighs. She gasps, her body arching into his touch, her own hands exploring the hard planes of his chest, the thickness of his cock. They're both breathless, their hearts pounding in their chests, their bodies slick with sweat and desire. They know they should stop, but they can't, not when they're this close to the edge, not when they've finally given in to the sin they've been denying for so long.