Prove it

"Prove it? How?" Lauren asked.

"Let's walk around the park for a half hour." Britney explained. "If anyone guesses you're a girl in that time, we'll see if anyone guesses you're a girl. If they do, you can have my clothes! If they don't, you have to do whatever I say for the rest of the day."

"Okay!" Lauren agreed. This was her chance! She could show Britney up in front of Kyle, win some real clothes again and get Britney stripped naked and embarrassed! It was too good a chance to pass up.

"Okay, but you can't tell anyone you're name or real gender, you got it?" Britney explained.

"Sure, sure." Lauren said confidently. She was sure that her innate femininity would show.

"Perfect." Britney smiled, taking Lauren's hand and pulling her along the path. "Dennis, start the timer!"