Envious of her stepbrother's new sex doll, Sophia Sterling decides to give him a real-life alternative. Teasingly stripping down to her lacy lingerie, she flaunts her massive, natural tits and round ass. Joshua Lewis, initially content with his doll, can't resist Sophia's allure. She gives him a passionate, sloppy tit-job, her jealousy fueling her lust. Joshua returns the favor, finger-fucking Sophia's wet pussy while she sucks his cock. Their sibling rivalry turns into a heated, incestuous affair as they explore each other's bodies, the doll forgotten.