I screwed up.?

So um me and my friends were on omegle and we were just messing around with random people and then I had an idea Id go on unmoderated and catch a dude beating his meat and showed it to her.

What backfired was her little 12yr sister saw it and not her I busted out laughing and then she said im going to tell my dad. I called bs on that and continued browsing on the internet. Some minutes past her dad drives by and my best friend warned me. So I grabbed my laptop in went inside the subway mens bathroom and turned the lights of and then waited till she went into the car. He pulled around and just sat there for a minute. I opened the door and saw the car and closed it again. So he left. Now she has friggen first period with me what are the chances of her dad coming and pwning me so HOW IN THE HELL DO I GET OUT OF THIS!