Taguchi, who had come to stay at a friend's house, was captivated by the beauty and mature charm of his friend's mother, Aya. Moreover, her slender yet well-formed large buttocks were so attractive that they stirred Taguchi's desires, making her seem far from just a classmate's mother. That night, when Taguchi went to the bathroom, he accidentally witnessed Aya having a phone call with her lover. Unable to meet her lover, Aya engaged in phone sex and masturbated, causing Taguchi to gulp down his nervousness as he decided not to miss this perfect opportunity and took action...