Whenever there's a spare moment in the day, her brother indulges in endless masturbation, his insatiable sex drive bordering on criminal. The sister worries about his future and consults with her extremely promiscuous friend, who says, "Then I'll take all that sexual energy off your hands!" and actually has sex with the brother! However, faced with a real woman's body, the brother's sex drive unleashes monstrous stamina! At first, the promiscuous women are delighted, but they're overwhelmed by demands for refills far beyond their imagination, making them convulse in orgasm after orgasm! In the end, they're defeated by massive internal ejaculations!
