Boredom and horniness drive a brother and sister to self-pleasure in the bathroom, but their game of cat and mouse turns into a heated encounter. The brother catches his sister masturbating, her wet fingers plunging in and out of her tight cunt. Anger turns to lust as he watches her ass bounce. They argue, but the tension is palpable. Soon, they're naked, the brother's massive cock standing at attention. The sister, fantasy-ridden, begs him to fuck her, to 'fuck the shit out of her,' as she puts it. Their tryst is cut short by an unexpected visitor, leaving them breathless and unsatisfied.