Ayano, a mother, has lived her life looking forward to her only son, Kazuki, growing up. Thanks to her constant tutoring, he successfully made it into college, but her heart is not at peace with her daily playfulness. One day, she is asked to tutor Kazuki's friend, Ikuo, and is in high spirits after a long time, but her long-forgotten sense of womanhood is starting to smolder. Unable to suppress her own rising sexual desire, she uses her voluptuous body to take the erect, young-smelling cock into her mouth as a reward for Ikuo's joy at his improved grades...