Ever since her son Kenzo was born, Kaoru had no sex at night and was growing increasingly frustrated. One day, Haruko, the wife of the Kato family who lived next door, was going on a trip abroad, so she was asked to take care of her son Yasuharu for a few days. Kaoru's heart was pounding because she had heard Haruko say that Yasuharu's dick was big... And on the day of the trip, Kaoru heard Yasuharu and her son talk about how his dick was 17cm, and she couldn't contain the throbbing in her crotch and she couldn't help it...