JUKF-055 My brother is my onapette Natsu-chan Natsu Tojo

Natsu, who has grown older and is more interested in naughty things than studying, has a 3-year-old older brother who stays at home all the time and watches her masturbate or bring her boyfriend in for sex. - There is. - One day, the older brother sneaks into Natsu's room on a daily basis and ends up failing, and from that day on, the power relationship reverses and the older brother becomes a servant, and as per his daily routine, his younger sister treats him like a butter dog. - He starts to treat me like that...They say we can't fight over blood, but there's this older brother and this younger sister!