性知識のない妹に、えっちなマッサージをしてみた結果…

I have a younger sister.
Her name is Kurumi...

Her body may have grown and developed nicely but... Inside her head, she's still just a little girl. In other words, me and Kurumi are alone together. On a day, with no interruptions, under the guise of a "massage", I teach her body the forbidden fruits of pleasure...