在户外散步，裙底下露出屁股

You go to the park and there's a sexy girl walking around in a very short skirt. As she walks and the skirt sways, you see a very teasing bit of her ass and it's clear she's wearing a thong. You follow her and watch as she gives you the best upskrt you have ever seen. It's a voyeur dream to have a girl shamelessly flashing her butt in public, right?