Shinichi has a wife and children, but he had been conscious of his mother as a woman... He knew it was wrong, but he couldn't suppress his overflowing sexual desire. Then one day, they lied to their respective families about going on a hot spring trip. Because he knew it was wrong, his released desires exploded. But he couldn't hold back anymore... After years, the first penetration made her confused at first, but she soon forgot herself and surrendered to the pleasure...
