As the family gathers around the fireplace, the Ken's eyes linger on his sister, her curves accentuated by the flickering lights. She catches his gaze, a blush creeping up her neck. Later, as the house sleeps, they meet in the hallway, their bodies pressed together in a desperate embrace. Her hands explore his chest, his hands find her thighs, their hearts pounding in sync. They stumble into her room, their clothes falling away, their bodies entwining in a dance as old as time. The creaking floorboards and their muffled moans become the only soundtrack to their incestuous holiday symphony.