In the dimly lit room, a sister's eyes glaze over with lust as she watches her brother sleep. Her mind races with dirty thoughts, her body aching for his touch. She tentatively reaches out, caressing his chest, her heart pounding as he stirs. He awakes to find her hand on his cock, already hard from her fantasies. She guides him onto her, straddling him and impaling herself on his length. They move in sync, their bodies slick with sweat, until they both climax, their voices mingling in a chorus of pleasure and taboo.