Shimazaki goes to visit his friend Takeo in hospital and is surprised by the shortness of his mother Aya's skirt when she greets him. He peeks at her as she climbs the stairs. Shimazaki cannot hide his excitement at the sight of Aya's lewd underwear, which is a stark contrast to her plain appearance. As if she could see right through him, Aya pulls down his pants and takes his erect cock into her mouth, showing off her erotic underwear.