Find a place with a female gloryhole. They usually allow you to bound her ankles to the wall so her pussy and ass are on display and easy to reach. Her head is the other side of a wall so she has no idea when or who is fucking her. You can set the rules, such as no anal, or condoms only, but for complete degrading it should be anal and both holes bareback. She can be held in that position for as long as you like but if you can prearrange it you can invite guys to come along and in a few hours she could have quite a few men. Afterwards she can dress in a short skirt or dress but with no knickers, and walk back to the car with the cum running out of her ass and pussy with each step