Get the siblings on their shopping trip. (Brother: Harunobu-kun, 21 years old, student) The older sister works in the apparel industry. Under the guise of a project to check their sibling relationship, it starts with each other's favorite foods and gradually escalates to questions like "Do you have a boyfriend?" "Have you ever kissed?" "Have you ever masturbated?" Leading the two who seem likely to go further into suggestive questions and towards nudity. The brother is shaken by the sister's admission of having a boyfriend. It seems he is, so-called, a siscon, viewing his sister as a romantic object. The caring older sister guides her faltering younger brother, and it doesn't end with nudity but goes all the way to having sex and even creampie!
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