GNAX-047 Forbidden adultery that only the innocent young wife and husband know about, who were sexually trained by their unfaithful father-in-law Ran Shiono

Gozo, the father-in-law, goes to Tokyo to visit his son and his wife, and seeing how busy his son is, he notices that the couple is not having sex. Since he is looking forward to the birth of his grandchild, he is convinced that it is essential to improve his wife's sexual appeal. One night, Gozo makes up his mind and forcibly forms a relationship with his wife. He trained his wife, who was late in sex, day after day, and quickly led her to fall in love with lust, but the result was a surprising one that only his son knew about.