Cloistered in a cramped space, siblings grapple with their forbidden longing. She tentatively presses against his hardness, whimpering as he grows. They freeze at a noise, hearts pounding, but can't resist the magnetic pull. He enters her, and they move in sync, their bodies slick with sweat and desire. Guilt gnaws at them, but they can't stop, riding the wave of ecstasy until they collapse, spent and ashamed, in a tangle of limbs and regrets.