Hidden from the world, two siblings surrender to their darkest urges. The brother's massive cock, usually concealed beneath loose clothing, now stands proud and ready. His sister, her tight cunt dripping with anticipation, can't help but stare. She reaches out, tentatively, wrapping her small hand around his shaft. He bucks into her grip, a primal growl escaping his lips. They're lost in their passion, bodies writhing, until a floorboard creaks, reminding them of the danger they court.