DAYD-010 My sister asked me to teach her. The dream-like seven days until I have sex with such a sister. Aoba Yuu.

One day, I was asked by my younger sister, Yuu, to teach me how to study. I thought I had met her for the first time in a long time, but for a short while, I almost fainted when I saw her bulging breasts peeking from her unprotected chest. I did! Even though I thought I shouldn’t. And so began seven dreamy days…