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A younger brother who went to a university in the city decided to live with his sister who was in Tokyo. However, my sister is a ridiculous spear man, and on weekends I make a fuss with my spear man girlfriends with erotic talk! When my younger brother who was dragged into the circle is a virgin, he gets caught ... Called a SEX study session and started a brush-down experience! I don't want to be robbed of my irreplaceable first experience! However, the piston cannot be stopped by the comfort of SEX for the first time! After all, all the spear man begged for Ji ○ port and ejaculate all night!