ATOM-369 For beginners only! Fixed electric horse race game

Five amateur girls challenge a fixed electric motor seesaw game to win prize money! They attach an electric motor to their crotch and stand on the seesaw, tilting lanes connected to it while maneuvering a rolling ball towards a goal with a top prize of 100,000 yen. Sudden vibrations from the activated electric motor cause them to react sensitively, making the seesaw wobble! The ball keeps falling!? Even crying and retrying in their underwear!? Those who can't clear the challenge will face the penalty game of being fucked immediately with their wet pussies stimulated by the electric motor!