[Atelier Lunette (Mikuni Atsuko)] I Want To Be! PURE - The Fuyukawa Family Siblings Story [Pluto]

Makoto just wanted to dress up as his favorite magical girl, frilly costume and all—but his big sister catches him in the act and wastes no time pointing out exactly how hard those childish panties are making him. What starts as merciless teasing about kindergartner underwear spirals into something far messier, as Makoto fills his diaper in Heart's costume and his sister decides he needs to be punished properly for being such a bad girl. A femdom siblings story where humiliation, soiled diapers, and a hard pounding from behind blur the line between shame and bliss.