Ayano, a mother, has lived her life looking forward to seeing her only son, Kazumi, grow up. Thanks to her tireless tutoring, he successfully made it into university, but her mind is troubled by the daily grind. One day, she is tasked with tutoring Kazumi's friend, Ikuo, and is in high spirits after a long time away from teaching. However, her long-forgotten sense of womanhood is beginning to simmer. Unable to contain her own rising sexual desire, she rewards Ikuo, who is pleased with his improved grades, by taking his voluptuous, erect, immature cock into her mouth...