I understand the need to do this, and once I start touching it, I can't control myself and need to 'go all the way'. Having said that, you should have just stood up and ejaculated onto the papers without getting on the seats otherwise. Leaving that behind is really thoughtless. How would you like to accidentally encounter that? As horny as I am, I wouldn't do that. If I'm behind a car in a parking lot, I'll cum on the blacktop or in the bushes, but this is different.