Until the dress is up to Mackenzie's stomach

(chapter originally by SpiralFelix at writing.com)

Willow figured she had waited long enough and besides she was just so excited to see the dress's progress. Okay, time to sell it. She didn't have to try too hard. She turned to face the redhead and got a full view of half of Mackenzie's naked body. The dress now came down to Mackenzie's toned stomach, ending just above her navel.

"Whoa Mackenzie!" Willow exclaimed in mock surprise as she savored the sight of her friend's exposed pussy.

Mackenzie followed her gaze and gasped. "What?!" She quickly placed her hands in front of her newly bared crotch. "How did this happen?!"

Willow slowly circled around behind Mackenzie, eyeing her lovely round ass. "Looks like it's getting unraveled back here" she said pointing at the still moving thread.

Mackenzie turned around and, after a few tries, was finally able to snap the trailing thread. The former skirt was now only a foot and a half long, but at least it was no longer shrinking on the poor girl. She gave a sigh of relief as the freed thread was pulled towards the ferris wheel. Her relief was short lived as someone behind her suddenly shouted "Whoa, nice ass!" This snapped the girl back to reality and she suddenly remembered that there was a crowd of people behind her. Even worse, the shout had started to get the attention of others, and Mackenzie could already hear laughter beginning to bubble up from the crowd of onlookers.

She clamped one hand over her pussy and tried her best to cover her shapely ass with the other. Mackenzie stood frozen, face a deep red, as more and more eyes focused on her bare body. This can't be happening this can't be happening no no no no! There were several shouts and jeers to go along with the laughter now, and more than a few cell phones pulled out.

"Mackenzie!" Willow shouted, trying to snap her friend out of it, "Mack come on!" That seemed to bring her back to her senses enough to notice what Willow was saying. "Come on, let's get out of here quick! Follow me." And Willow began running away from the crowd with Mackenzie following close behind.

The two girls were successfully able to get away from the boisterous crowd as Willow lead them...