It's been a long time since I've seen my wife's parents' house.So when I saw Chihiro-chan (her wife's little sister) with a different atmosphere, I was a little nervous.Chihiro, who she always thought was a child, had become an adult woman.She became conscious of herself as a woman.When her wife went out and was alone with her, I couldn't control her sexual desire that suddenly came up and I committed Chihiro-chan.