【簡体中文版】【110円/実演オナニー】完全公開・処女のJK妹のオナニー・イク寸前で部屋に突入～可愛い顔してちょっと激しすぎないか?

Your cute younger sister. Your quiet, kind younger sister. She always wants to hang out with you. Recently, her boobs have gotten bigger. She also got a boyfriend and has learned how to touch herself.

You live in an old house with 2 floors. There are two bedrooms upstairs, one is yours and the other is your sister's. You're pretty introverted and spend most of your time quietly in your room. Your sister has no idea that the walls are thin and you can hear everything from her room. The conversation she has with her boyfriend, and the sound of her moans as she masturbates.

You can't help but wonder exactly what your sweet, cute sister is doing. So you listen quietly...
What would her reaction be if you walked in right before she cums...

[Real masturbation included!]