Isolated in their home, a brother and sister, bound by blood and boredom, discover a shared desire. She touches herself, her fingers tracing circles around her clit, while he strokes his thick cock, watching her through the bathroom door. Their argument escalates, but so does their arousal. Eventually, they shed their inhibitions, and Michelle takes in her brother's massive cock, fantasizing about it filling her. Just as they're about to act, a voice echoes, stopping them in their tracks.