I have a sister who's two years younger than me. She's the plain, bookish type, so I never paid her much mind. But one day, everything changed.

That was the day she got a cell phone. After that she got into makeup, started to dress flashy and dye her hair, and got pretty cute... she was like a totally different person.

She also started using lots of dating apps and playing around with men. She's become a real woman, and lately I've found myself sort of fascinated...

One day I walked into the living room, and there she was asleep on the couch. Her sexy body was utterly defenseless. So, I had my fun with her tits, ass, and pussy, and then I kept going...

Later that night, I opened my eyes, and my sister was on top of me! She said she was getting revenge for earlier.

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• Yuu Ichinomiya — Story & Art