I Am In So Much Trouble

I am a mid 30's guy. Something happened over the weekend that has me worried big time. I was at a friends house for a cook out. He has a swimming pool in the back yard and a hottub on the deck. At one point all of us were swimming and romping in the pool.
My friend has a 12 year old daughter. Nothing pervy, I had no sexual thoughts about her. At one point during all the horseplay she grabbed my dick. I was a little surprised but just let it go thinking it was an accident. Then a few minutes later it happened again. This time I looked at her and gave me a smile. She had done it on purpose. Now that we were both aware of what was going on I tried to avoid her and push her hands away without being obvious and calling attention to things. She wouldn't stop. At one point I was hanging on the edge of the pool in the deep end and she managed to slip her hand down my trunks. I tried not to freak out as she had a death grip on my dick. She was calm as a daisy as she began stroking my dick. I couldn't help it, I got hard and after a minute of having her little hand stroke me I shot my load right there in the water. She giggled and swam away like nothing happened.