Naive teen sister, curious and alone with her older brother, finds herself drawn to his manhood. With the house empty, she sneakily watches him shower, her eyes widening at the sight of his enormous cock. Unable to resist, she enters the bathroom, feigning innocence. As he towels off, she playfully grabs his dick, causing him to harden instantly. They lock eyes, and she tentatively takes him in her mouth, gagging slightly at his size. Her inexperience fuels their passion, leading to a raw, amateur session where she explores every inch of her brother's body, from his throbbing cock to his tight ass.