The father's new wife was beautiful despite being the same age as him, and she became an object of desire for his son. The son decided to leave home because things couldn't go on like this. They went on a family hot spring trip one last time. The father passed out drunk. Alone with his beautiful stepmother...the son couldn't hold back any longer and gave in to his desires. Despite her confusion, the stepmother couldn't resist his advances and ended up accepting his love for one night. Overwhelmed by guilt and the thrill of a young, erect penis, the stepmother lost herself in pleasure. This is a taboo story of incest between a stepson and his stepmother.
