Taguchi, who came to stay at his friend's house, was captivated by his friend's mother, Ai, a beautiful woman exuding mature sex appeal. Her slender yet voluptuous big ass was so attractive it stirred Taguchi's lust, making it hard to believe she was his classmate's mother. That night, while heading to the bathroom, Taguchi witnessed Ai on the phone with her lover. The conversation escalated into phone sex due to her loneliness, and as Ai began to masturbate, Taguchi watched with bated breath. Not wanting to miss this perfect opportunity, he decided to take action...