My niece had always been very fond of me. Maybe it was because my brother and his wife were busy, so she often came to my house nearby. As her school entrance approached, I noticed how much she had grown. I feel like that was when I started seeing her as a woman. During spring break, my niece accidentally saw an erotic video on my smartphone. I thought it was bad, but... I crossed the line with my niece, who had become interested in sex. To kill time, I'd make her squirt with fingering, make her cum with toys, or fuck her without a condom. Neither of us has romantic feelings; we're just continuing this physical relationship out of curiosity.