思春期真っ盛りで背伸びしたがるお年頃の妹にオナニーしてるのを見られ慌てて隠したら「私だってそれくらい知ってるもん！私がしてあげよっか？」と…
My younger sister, who is in the midst of puberty and wants to grow taller, saw me masturbating, and when I hurriedly hid it, she said, "I know that much too! Should I do it for you?"...
