The scent of soap fills the air as the brother's hands glide over his body, washing away the day's grime. Suddenly, the bathroom door creaks open, revealing his sister, her eyes wide with surprise and something else - desire. Her gaze travels down, taking in his hard cock, straining against the towel. He watches, frozen, as she steps closer, her breath hitching. The room grows hotter, the air thick with unsaid words and pent-up lust.