One year ago, a young and beautiful stepmother suddenly appeared. The son was bewildered by her unexpected arrival, yet found himself irresistibly drawn to her body, overwhelmed by uncontrollable desire. On the day he decided to leave home, the family went on a hot spring trip together. At the inn, his restraint finally broke—he gave in to pleasure, groping her breasts and losing himself in ecstasy. Despite being step-mother and son, his lust could not be contained, and she surrendered to this forbidden thrill. She accepted his cock, engaging in a single night of taboo passion. A forbidden incestuous relationship between stepmother and son unfolds.