JUY-651 The obscene workout attire of my wife's friend drove me mad... Yuino Saihara

I haven't been exercising recently and my body has become flabby, so I asked my wife's friend Yui, who used to work at the gym, to teach me how to train. Even after her marriage, Yui-san, who has been working on her own training, has a very beautiful body and she was nervous just because she was training alone. And on that day, she got an erection unconsciously when she was taught by Yui who was wearing a sportswear that fits her body.