Give her an out

"Shelby, tell no one you have to obey me. If you can get 28 people to squeeze your tits, you can put your top back on. If you can 28 people to slap your ass...hard...you can pull your shorts up. When you ask, 'I'm Shelby "The Slut Summers," would you like to squeeze my tits or slap my ass really hard.' Try your best to get all of that done in 30 minutes."

"Oh my god!" said Shelby. She shuffled off to where a couple of guys were stretching while they oggled her. They each had bulges in their shorts. "I'm Shelby 'The Slut" Summers, would you like to squeeze my tits or slap my ass really hard?"

"Sure!" said one of the boys. "I'll do both!" The guy squeezed Shelby's tits then she turned and he slapped her ass as hard as he could.

"OW!" she yelped.

Shelby turned to the second boy. "I'm Shelby 'The Slut' Summers, would you like to squeeze my tits and slap my ass really hard?"

The second boy did the same as his friend.

Shelby knew she had to hurry as fast as she could, but it was not easy with her shorts around her ankles.