Nanami, who is an idol in Tokyo, returned home and heard from her mother that her younger brother's appearance was strange recently, and when she asked the reason directly, it was said that the girls in her class made a fool of her being a virgin. My father asked me to cheer him up, so I tried to touch my boobs to teach my younger brother the goodness of the girl ... Did I suddenly wake up to something? Raw insertion! After that, my younger brother chased me all the time and asked me to mate everywhere in the house ...