My younger sister, Mei, was quiet and quiet, but she was attached to me. - Although my parents don't realize it, my sister is actually very curious about sex, and even though I live alone now, I've been playing pranks on her for a long time. - One day, his parents return home to check on his grandfather's injury. - However, my sister didn't want to go with me, so my parents, who were hesitant to leave their daughter alone at that age, called me. - My sister and I, now alone together, crossed the line and became engrossed.