FERA-146 Son's friend saw the beautiful mother's embarrassing, tacky underwear, Saiki Oishi

One time when I went to Ooiso's house, Yokota saw Ooiso's mother, Saiki, in her underwear. A massive pair that completely hid her stomach. The shape, which had nothing to do with fashion, shocked Yokota. Underwear that was not expected to be seen was much more vivid and erotic than seeing a beautiful woman in her underwear on the net. From that day on, Yokota started visiting Ooiso's house at every opportunity to steal Saiki's underwear. Eventually, he came to think that Saiki was the only one he could offer his virginity to.