[JUKF-067] My brother is my onuppet's mother, Sato's?

There is an older brother in Sannami who is peeping at the place where the younger sister masturbates and the boyfriend is brought in and it etchs when it is attracted to the house for a long time in the girl and no-no-chan who is interested in the naughty thing than studying. One day, the brother of the pervert sneaked into The Room of No-No-No and went night after night ● It failed, and the big brother who reversed the power relationship on the boundary of the day and turned into a lower me was treated as a butter dog by his sister like a daily routine. Is it a place where this elder brother is made this elder brother and there is this younger sister though either is either?