In the dimly lit room, the siblings' bodies hum with forbidden energy. Her nipples hardened, she bites her lip, stifling a moan as he trails a finger along her arm. He's rock hard, his cock straining against his jeans, the outline clear. She licks her lips, her eyes flicking down, then back up to meet his gaze. 'I can see it, brother,' she breathes, her voice barely above a whisper. His response, a hungry groan, 'And you want it, don't you, sis?'