During one weekend day, you and your friend will travel to your local park with you wearing a loose top, shorts and shoes. You will not be wearing a bra or panties. Your friend will be carrying a cell phone with camera.
At any location along the public walkway that had dense bushes just off the path, after ensuring no one was close to see you, you will take off your top and shorts and lay them out in the middle of the walkway. You will go and hide behind the bushes. Your friend will immediately take a picture of your clothes on the walkway with their cellphone.
You will wait behind the bushes and masturbate but you're not allowed to orgasm. Your friend will wait by your clothing.
Whenever someone comes along the path and stops at your clothing, your friend will explain that you're naked in the bushes and they are welcome to go look at you. Your friend will explain to the stranger that you're a naughty girl who needs punishment. Your friend will choose whether you will be spanked by hand or with a belt which your friend has brought along that day.
For every 15 minutes that passes that someone doesn't stop at your clothing or spank your bare ass, your friend will tear off a piece of cloth from your shirt or shorts.
Have fun and post a very detailed report of the entire "adventure" from leaving your house to returning home!