In a sunlit room, a teen boy sprawls on his bed, his large cock tenting his shorts. His sister, a curious virgin, watches him from the doorway, her eyes wide with a mix of fear and fascination. She approaches, her heart pounding, as he pulls out his massive dick, stroking it slowly. She hesitates, then tentatively reaches out, touching it gently. He groans, encouraging her. She wraps her small hand around it, feeling its pulse, its heat. Her body responds, her panties dampening as she explores his length, her innocence giving way to raw, teenage lust.