<human>: Can you summarize the given text in a few sentences?

I'm an 18 year old guy who recently had a new family move in next door around a month ago. They have a 10 year old daughter who, ever since they moved in, has had a weird sort of obsession with me. She tries to talk to me every time were both outside at the same time, and she follows me around any time she gets the chance. 

Her parents find this really strange because well, I'm 18 and she's 10. I'm nice to her because I don't want to be an asshole, but I try my best to stay away from her because of her parents not trusting me. 

Today, the girl and her mom and dad came over for dinner at my house to get acquainted with my mom and dad. After dinner, the girl decided that she wanted to go jump on my trampoline and insisted that I come too. We went outside and her parents came outside to watch her for safety reasons while my parents cleaned up the dishes inside. 

She had apparently just watched some action movie recently, because this 10 year old girl REALLY wanted to play fight. So before long, we were both jumping into the air flipping at each other like ninjas. 

On one jump, I threw my arm out in a karate chop and my arm ended up near the lower part of her back. We came down on the trampoline and she landed on my hand hard. We both laid there for a second catching our breath with my hand still under her. I didn't notice the position of my hand because I was looking up at the sky instead of at her... I thought I was touching her upper back or something. 

Before long, her dad walked over to the trampoline and snatched her up into his arms and gave me a really nasty look. That's when I realized that my hand had been on her butt the entire time. I couldn't even explain anything before they took their daughter and went back to their house without a single word.
<bot>: was playing ninja on a trampoline with 10 year old girl. Ended up grabbing her ass and losing the trust of her parents forever.