The hush of the empty house echoes with the soft sounds of their lovemaking. His sister's breath hitches as he traces the curve of her spine, her body arching into his touch. They move together in silence, their bodies communicating their desire more clearly than words ever could. The only sound is the rustle of sheets as he enters her, their bodies moving in a dance as old as time, their shared orgasm a silent cry of release in the quiet of the night.