Koji, who had to stay out for several days after the water pipe of his house ruptured, was forced to stay at his friend Ichiros house during that time. - Koji, who was secretly a butt fetish, secretly feels the joy of spending time with Ichiros wife Yus whip butt. - Then, by chance, I witness Yuu sticking out her ass in sexy underwear. - Koji, who has been erected with excitement, asks Yu to apply her beauty oil with her smile.