少子化の昨今、子孫を残そうと家庭でも性教育が盛んに？母と姉は1人息子の僕に、実践的な性教育をしようと自ら練習台に…それでもモノ足りないと思ったのか家庭教師まで投入され最後には「おさらい」と称して母・姉も加わっての大乱交性教育！？
With the declining birthrate, sex education is flourishing at home to leave offspring? My mother and my sister, who have only one son, put themselves on the practice table in order to give them practical sex education. Great sex education with the addition of! ?
