The creak of the floorboard alerts the sister to her brother's presence, her heart pounding in her chest as she feels his gaze on her exposed pussy. She freezes, her breath hitching as his eyes linger on her wet, swollen folds. The room fills with the sound of their ragged breaths, the tension palpable as they lock eyes, the brother's hand slowly moving to stroke his visible erection through his pants, the sister's own hand inching towards her aching clit, ready to give in to their taboo desires.