It has been quite a while since I last visited the city to see my younger brother's family, so this time I decided to take my full two days of leave to meet them. As soon as I walked in, I was surprised to see that the little niece, who used to be small and innocent, has now become a charming high school girl in a seductive short dress. She was very happy to see me, and even tried to find ways to have physical contact with me. At that time, I felt normal because I thought she was still innocent, just in high school, and didn't think much of it. But her actions became strange. She started sitting on my lap and moving her buttocks, causing my penis to instinctively become erect. I was very, but also partly excited, so I pretended like nothing was happening. Perhaps I was too lenient, so the little girl then daringly did something that I couldn't even imagine. She secretly unzipped my pants and gently held my penis, inserting it into her small, beautiful, and wet vagina of a teenager. It seemed like my body was being by her, as she continued to move up and down, while I could only sit still and enjoy it.