In the throes of sibling rivalry, Michelle and her stepbrother find themselves alone, bored, and horny. Michelle retreats to the bathroom, fingers herself, and strokes her ample curves, but her stepbrother catches her mid-act. After a heated argument, they decide to masturbate openly, with Michelle taking in her stepbrother's massive cock. Just as they're about to give in to their mutual desire, an intruder forces them to abort their taboo encounter.