When the crew leaves the set, Whitney tells Natasha that they have about 2 hours before they have to work again, and they may as well have some fun while they're alone.
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The thing about Natasha is that she doesn't play nice--she's a horny whore who just wants to get fucked and won't stop coming back for more! Pistol's requirements of discipline and respect, but caves quickly knowing that she'll be allowed to dominate her submissive whore step-sister as well.