In the quiet of their shared home, a brother and sister, both in the throes of adolescence, find solace in self-pleasure. She fingers her wet slit, imagining forbidden scenarios, while he strokes his thick cock, fantasizing about her full lips. One day, caught in the act by each other, they argue, but the tension only serves to heighten their arousal. They decide to masturbate openly, their bodies entwined, until a sudden interruption forces them to abort their taboo encounter.