Accidentally seeing her brother taking his girlfriend home and having sex, Namiki had a lot of lewd thoughts in her mind. She finally knew that her younger brother had begun to grow up and this was also a good time for her to fulfill her long-held wishes. Many times she deliberately brought her boyfriend home and then rained with him but did not close the door to the room, the purpose was so that the innocent brother could see all those scenes and arouse in him the thoughts and desires burning on her slender body. Not unexpectedly, after just a few times like that, he was completely collapsed. Although he knew incest was taboo, he knew how to do it when their craving had reached its peak, and he couldn't control it anymore.