Find the streaker

"But how do we find her?" Abby pointed out. "You can't see her face, it could be anyone!"

"Not me! I don't have an ass the size of jumbo beach ball!" Laughed Megan.

"Don't worry gals: I noticed something." Veronica said, showing the others her phone with a close up of Lauren's ass.

"She's got a birthmark on butt!" Abby pointed out.

It was true. Lauren had a birthmark there. It had been a small, discreet thing, but now that her butt had ballooned in size, it was a large area of slight discoloration.

"We just have to find whoever has this birthmark on their butt, and that'll prove they're the streaker!" Veronica explained.

"Yeah, but how will we see everyone's ass?" Megan asked.

"I don't know, we'll have to figure that out..." Veronica said thoughtful.

Lauren was pouring sweat, her knees shaking. She could NOT be discovered, her reputation would be utterly destroyed!