The scent of tobacco mingles with the siblings' growing arousal. The sister, entranced by her brother's lips around the cigarette, feels a warmth between her legs. Her brother, noticing her gaze, smirks, blowing smoke rings that dance around her face. She reaches out, her fingers brushing against his thigh, feeling the heat radiating from him. His cock twitches, straining against his jeans, a silent invitation to their forbidden dance.