As the rain pours, the siblings huddle together for warmth, their bodies pressed close in the tiny closet. The girl, her eyes wide with fear and excitement, reaches out, tentatively touching her brother's cock through his wet robes. It twitches at her touch, growing harder, and she gasps, her pussy throbbing with need. She pushes her habit up, revealing her bare pussy, and guides her brother's cock inside her. They fuck frantically, their bodies slapping together, their moans drowned out by the thunder, until they both collapse, spent and panting, their sins washed away by the storm.