The old man's eyes widen as his granddaughter straddles him, her young, firm body pressing against his. "Let me show you, grandpa," she whispers, her small hands guiding his onto her breasts. He hesitates, then squeezes, feeling her nipples harden. She moans, her hips moving in a slow, tantalizing rhythm, her wetness soaking through her panties, as she whispers, "Rougher, grandpa. Show me what you've got."