Her husband is away, and married woman is indulged in sex with her sex friend at home

It's been a few months since my husband and son Shinichi started to get into sumo, and this Saturday, the two of them were going to watch sumo. Then, on Saturday, Keiko leaves behind her husband and Shinichi go out to watch sumo... A few minutes later, a young man comes to the house. The man's name was Tanaka, and he had an acquaintance with Keiko at the supermarket where he was working part-time. Then, until my husband and son come home, the day of having sex begins at that moment, with a time limit...