真面目でいつも勉強ばかりの妹から、
ある日突然、セックスを教えて欲しいと頼まれる。
兄妹でそんなことダメだと兄は断るも、
賢い妹に論破されてセックスすることに…!?
勉強熱心な妹は色々なプレイに興味を持っていて
兄は妹に毎日性教育をすることになり……。
基本CG13枚
文字あり122枚
文字なし98枚
合計220枚
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