As the storm outside rages, so does the tension between the siblings. They're alone, the power out, the house dark except for the occasional flash of lightning. He's drawn to her, her scent, her warmth. She feels it too, her breath hitching as he inches closer. Their fingers entwine, her pulse racing as he brings her hand to his lips, kissing it gently. She can feel his hardness pressing against her, his desire evident. The thunder roars, and she can't help but think it mirrors the intensity of their longing. He leans in, his mouth finding hers, their kiss electrifying, a bolt of desire igniting their taboo passion.