What's the harm in just asking?

Anna casually, but carefully walked up to the girl and tapped her on the shoulder "Um, excuse me?" she asked meekly

The girl turned around "Yes?" She replied, until she saw that Anna was naked also

"I uh...wait, you look familiar..." Anna couldn't put her finger on it as she lost her original train of thought

"I'm Mandy...and you are?" The girl replied in a rather flirty tone

"Anna...I mean...dammit..." Anna sighed in defeat, accidentally giving her identity away

"Anna huh? I didn't see you come in with my class...or see you take off your clothes" Mandy says, a sly smirk forming on her face

"I...well I...you don't have any to spare? Do you?" Anna asked hopefully

"So that means YOU'RE the naked girl everyone's been talking about?"

"I...but...please?" Anna started blushing an even deeper shade of red than she already was

"You could buy my silence" Mandy said with a wink.

"What do you mean...?" Anna asks cautiously