These girls work part-time at a ryokan, washing the cars of guests staying there. They're soaking wet, but they're wearing swimsuits under their uniforms, so it's totally fine! They press their boobs against the windshield and side windows while washing the cars, which is super erotic! Looking at them from inside the car, it's only natural that your crotch is throbbing... When the girls notice this, instead of backing down, they take the guests to their rooms at the ryokan and give them some naughty after-sales service! Both the car and the glans are sparkling clean!