Challenge her to a race through the park.

"How about we do a race through the park, whoever arrives first from the entrance to the exit wins", you say to her.

"A simple race huh ?, then you're sure to lose, because i'm actually in the girl's sports team if you didn't knew", Megan replies, upon which, you began to question your decision of the challenge.

"Well...i...", you say as you try to think of a clever comeback, "Well, but since i'm naked, i'm more aerodynamic than you", you say.

"That's stupid, being naked doesn't make you faster", she argues.

"And how do you know, have you ever been in a race while naked ?", you reply back.

"I....", she simply says as she tries to think a clever comeback, "Ok, how about this, since i'm obviously the faster one, i'm going to be generous to you, and declare that i shall do the competition in underwear, just to rub it on your face", she says back.

"Then undress, i'm waiting", you say as you thank yourself of making her fall for such a trick.

"Fine, i'm going to win either, so i've nothing to worry", she says as she takes of her blouse and skirt, and puts them in her purse, leaving her in only a pair of pink panties and tanktop.

"Let's go to the entrance then, you flattie..", she says with a hint of embarrasement, upon which, the two of you go to the entrance of the park, ready to compete with one another.