Photoshoot in the Park

Olivia couldn't believe how well this was going as she handed Amy a bottle of baby oil, after a thick coat was applied and Amy was shiny and slick with oil, Olivia guided Amy through different Yoga and sexual poses capturing it all in high definition.
The entire time Amy was paranoid someone would walk in on the scene but so far the two had been left on their own.

After the warm up Olivia pulled out an assortment of snacks she had Amy eat or rather attempt to deepthroat a banana until she gagged. Then slowly sensually lick an ice-cream cone.

Time seemed to drag on forever as the naked teen felt she had been here for hours but was realistically only about 30 minutes.
Amy's nerves had not faded in the slightest. As she tried to maintain her composure.
She could hear dozens of voices just on the other side of the tree line.
Her mind felt like it had a neon flashing sign going *You are NAKED and OUTSIDE, find cover stupid!*.
But she fought every natural desire she had and continued to pose for Olivia.
Amy was once more handed the Vibrator but this time told to fit as much of it into her mouth as she could. Amy made a face of disgust at the idea of licking her own used vibrator but did as she was asked fitting in a good 5 inches before immediately gagging.
The taste was actually not bad but the pressure on the back of her throat had been too much.
She coughed and sputtered as a thin trail of drool ran down the side of her mouth onto her chest.
Olivia's laughter at the scene was piercingly loud and echoed in Amy's ears as she recovered. Amy was paranoid Olivia would attract someone to their location.

"Shhhh, keep your voice down." Amy pleaded.

"Awww, why so shy Amy?" Olivia mocked. "Is it because YOU'RE COMPLETELY NAKED?" She yelled the last bit at the top of her lungs. Causing Amy to wince and redouble her efforts on listening for signs of intruders.

"Alright Amy, we're going to do one final little challenge for you today, one that will really test your limits." Olivia said with a sly smile on her face. "Answer quickly someone's probably coming right now."

A cold shiver ran down Amy's spine at Olivia's words. What had she been doing all day if not testing her limits.
She didn't want to know what this new challenge was. But she knew she couldn't back out. Not with what had already happened.
"Master has given you a choice for your final task, choose very carefully. Would you rather masturbate until someone catches you not stopping until climax. Or get walked back to the car naked?"
Amy's eyes shot wide at the options presented to her. Both felt like nightmares to the exposed teen. But after much consideration she realized...