Because my older sister and her husband were on a business trip, I ended up taking care of my badly behaved niece for a few days. From the moment my sister left, she started teasing me, an adult, with a deliberately exposed panty shot and a very cheeky attitude. I thought she was just a niece and underestimated her, but her ass was actually well-developed!! Unable to stand it anymore, I grabbed her big ass and immediately inserted my adult dick and punished her with a piston! I made her cum many times until my niece changed her attitude! She drooled and moaned in ecstasy, and her rehabilitation was complete!