Disaster strikes!

"We will be there." Britney said, eyeing Lauren like a hungry cat. Lauren shuddered to think what this evening had in store her for. Her foreboding imagery was interrupted by her sister, who put a hand on her shoulder.

"Come on Lauren." Vanessa said. "We've got to get going, keep our heart rates up, and burn some of that fat!"

Lauren eagerly turned to leave. Anything to get out of this situation! When she turned around she unwittingly revealed her rather plump pantie clad backside to David and Britney. Just as she took a step to leave, disaster struck. Whether it was her sudden movement, or just the continuing strain of her large butt cheeks, the undersized panties could take no more and split at the seam!

SHHHRRRIPP!

Lauren froze. She felt as the butt of her panties split wide open. Looking over her shoulder she saw her entire buttcrackw as exposed! Generous cheeks wer pouring out the rip,w hich ran all the way from her waistband down her butt. She was mooning Britney and Jennifer! She looked over her shoulder back at them. They burst out laughing.

"Oh my god!" Britney laughed. "Lauren's fat ass just ripped out of her panties! HAHAHA that's hilarious!" Britney was doubled over with laughter. David couldn't help but laugh as well. Lauren looked so ridiculous, with her butt hanging out, looking over her shoulder with a pitiable expression on her face.

"Ooh Lauren, I warned you that was too much pie!" Vanessa chided her. "Now your butt is too big for your panties!" She turned back to Britney and David. "See you guys tonight!"

With that she pushed Lauren on. Lauren eagerly ran away, though this gave Britney and David a parting view of her shaking ass as she jogged away, cheeks jostling out the split underwear. Lauren's ears burned as she heard them laugh even harder.