Unbeknownst to their parents, young siblings, curious and horny, retreat to their shared room. The sister, a busty amateur, starts touching herself, her moans barely contained. Her brother, hearing her, peeks in, catching her in the act. They freeze, then share a charged look. He joins her, his hard cock tenting his boxers. She watches, licking her lips, as he strokes himself. Their bodies press together, clothing shed, until they're bare, their breaths ragged. Just as they're about to cross the final line, a floorboard creaks, and they freeze, their illicit encounter interrupted.