My brother and his wife went abroad for urgent work. While I'm away, I'm supposed to take care of my niece Hikaru, but we're strangely close to each other, and as if to show off we're all defenseless. One day, he encounters Hikaru masturbating in the living room and finds out that he is peeking at her. However, it was a show-off temptation from my little devil niece!
