Onee-chan no Seikyouiku ~Cool ni do M Choukyou Shite Ageru~

お姉ちゃんの性教育～クールにドM調教してあげる～

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Little brother Izumi is curious about sex things, so he asks the highest authority on grownup things... his older sister, Kanna. The cooldere onechan is happy to show him everything...