JUY-651 My wife's friend's obscene muscle training pose made me lose my mind... - Yui Aihara

I haven't been exercising lately and my body has become flabby, so at my wife's suggestion, I decided to ask Yui, a friend of my wife's who used to work at a gym, to teach me how to train. - Yui, who has been working hard on her own training even after getting married, has a very beautiful body and was nervous just by training alone. - And on that day, as Yui, wearing sportswear that fits her body, was teaching me how to do muscle training, I unconsciously got an erection...