She doesn't know!

Jenna's rivals as well as Abbey's friend Mark had given up all presence of not just capturing the class in photo and video format. The professor loudly announcing her welcoming attitude with sharing her space with other artists they sat down onto the outring benches in the gazebo only 10-20 feet behind Jenna and Abbey.

Jenna was still lost in flirty thoughts and didn't notice the change in her companion at first.

Mark did though. As the class began an exercise starting in downward dog. With hands on the ground and asses pointed high in the air Mark pulled his lens off Jenna long enough to notice the twin lines of small holes dotting the seam on the stretched bottom of Abbey's yoga shorts. The stitching was pulling at the fabric itself due to the extra booty currently contained in the too small shorts.

Mark was amazed at the wearwithall of the straining fabric as the class shifted into cobra pose. Curving the spine the other direct and driving the hips toward the ground. The class was instructed to imagine climbing under a fence or limbo stick. Curving the spine with each transition not just moving the hips forwards and back.

The end result was while Jenna's naked ass was getting the majority of the attention at the moment, but Marks camera was firmly on his best friends behind. As it rocked back and forth everytime she came out of cobra into downward dog her hips lifting off the ground the reknewed pressure on the shorts pulled the fabric just as tight weakening it just a little more.

Abbey was having a blast, feeling completely free next to her mentor. She felt the sensation in her shorts as they started to stretch beyond their limits but though nothing of it.

Until finally it happened. It started with a single gentle pop. Roughly on level with her asshole. The hole was suddenly twice as wide as the threading holding the panels together finally snapped.

This small pop turned into a chain reaction with the next application of pressure. As the teens bottoms split with a soft snap. Her entire slit from the top of her asscrack all the way to a half inch above her clit was suddenly open to the morning air...