My niece 'Yui' has always been fond of me since childhood, affectionate and sweet. She developed a taste for erotic things, and as I listened to her and played with her over time, she began to take liberties with me, even saying, "You're my servant." Every three months when we met, she matured more and more, demanding various sexual acts like handjob, full nelson restraint, pretending to be in an AV, and sex teasing. Gradually, I was drawn into her aggressive dominance, continuing this relationship for ten years.