In the quiet of their shared home, a curious stepsister stumbles upon her stepbrother's predicament - a throbbing, tented sweatpants situation. Unfazed, she lends a helping hand, her small, soft palm wrapping around his thick, pulsing cock. She strokes him gently, her eyes wide with newfound curiosity and a hint of taboo excitement. His groans fill the room as she works him, her touch growing bolder, more confident, until he spills his load, gasping her name.