MASM-026 - A friend's younger sister with a clear appearance, but is actually a very arrogant girl. Being insulted with "You are insignificant" in polite language, and subjected to semen extraction, Ichikawa Riku.

I ended up alone with my friend's polite younger sister, Riku, at my friend's house, and we started playing a game together. I was flustered by the suggestion of a penalty game where "the loser has to do whatever the winner says" and ended up losing. I wondered what kind of cute command my sister would give, but she smiled and said, "Take all your clothes off"... Huh? She, who looked pure, was a super S disguised as a J-type! She kept making erotic requests in polite language, and the hellish days of being milked as a living dildo began.