One day, a friend of the mother named Sayuri came to the house to attend her son's graduation ceremony. Despite being the same age as the mother, Sayuri's beauty was astonishing, leaving her son Shinji so nervous that he couldn't even face her properly... Seeing his innocent demeanor, Sayuri felt a surge of affection and suddenly kissed him. Shinji, who had never been in a relationship with anyone, tried to maintain his composure by escaping into the bathroom. However, unable to control her heated body, Sayuri stealthily sneaked into the changing room...
