Get the siblings while shopping. (Brother: Harunobu, 21 years old, student) Her older sister works in the apparel industry. Called a project to check on the relationship between the siblings, the questions started with questions about each other's favorite foods, and then escalated to questions such as ``Do you have a boyfriend?'' ``Have you ever kissed?'' ``Have you ever masturbated?'' He asks the two who seem like they're ready to go, asking naughty questions and leading them into intercrural sex. The younger brother is upset about his older sister's comment about having a boyfriend. Apparently, he is a so-called "ciscon" and sees his older sister as a love interest. A caring older sister leads a reluctant younger brother, and it doesn't end with just intercrural sex, he fucks and even cums!
