A naive amateur girl found on the street challenges a game: "If you can endure 10 minutes of tickling, you'll win a prize of 100,000 yen!" At first she endures, but gradually escalates with the superb technique of a skilled av actor!! Her sensitive parts are tormented, her body writhes, moans escape, and her whole body trembles, her eyes roll back, her face convulses, and she reaches climax! She even cums for real, leaking pre-cum!! Creampie sex with a big dick into the trembling amateur pussy!!