My niece had always been kind and affectionate toward me. Since my brother and his wife were busy with work, she frequently visited our house, and we naturally grew close. As her school entrance season approached, I began noticing how much she had grown. That's when I started seeing her as a woman. During spring break, she accidentally came across porn videos on my smartphone. At first, I thought it was trouble, but realizing she had developed an interest in sex, I crossed the line. Out of mere curiosity, I continued the relationship in various ways—fingering her until she squirted, making her climax with toys, and having bareback sex—all just to pass the time, with no romantic feelings involved. "Niece and Time Killer," a collaboration with a popular doujin work, portrays this impure relationship born out of everyday life. Check it out now!