While I was searching for sex material on erotic sites as usual, I happened to see an advertisement for a mature woman soap. Normally, I would ignore such advertisements, but since I had just gotten paid for my part-time job, I decided to take a look inside out of curiosity. As I was watching it, I got horny and wanted to go to a soap, so I immediately called and selected Reiko, the most popular girl. I went to the store, imagining Reiko's face, which I didn't see in the advertisement, and was astonished. Reiko turned out to be my mother!