The house is quiet, but the tension is palpable. The stepbrother's cock twitches, eager for his stepsister's touch. She's more than willing, taking it deep into her throat, her lips stretching to accommodate his size. She's a natural, sucking and licking, her hand working his shaft in tandem. Their bodies flush against each other, her pussy grinding against his thigh, seeking friction. Mom could walk in any moment, but that only spurs them on, their desire outweighing their fear of discovery.