Tommy, a lanky teenager with a cute face, finds his sister's innocent curiosity irresistible. She's never seen a cock before, and her wide-eyed wonder as she explores his is both exhilarating and terrifying. He watches, mesmerized, as she tentatively strokes him, her small hand barely fitting around his girth. She looks up at him, her eyes filled with questions, and Tommy, unable to resist, guides her head down, her soft lips wrapping around his cock, taking him in, inch by inch, her innocence clashing with the lewd act they're now engaged in.