Take the bet

(chapter originally by worlddominator at writing.com)

Isabel takes the bet with a quick breath and continues to run, trying to conserve the most energy. She tries very hard and the sweat caused her shorts and panties to slip revealing her buttcrack. She doesn't care as pulling it up will only increase her fatigue. She also stops covering her breasts seeing how much energy was being wasted and continues running with her breasts flopping about. Kelly and Heather just stood watching, laughing at her. Unfortunately, after 50 minutes of running, Isabel couldn't handle it anymore and tripped, pulling the safety cord and leaving Stephanie the victor.

"Time to pay up'" said Kelly.

Isabel tried pulling off her shorts separately but, the sweat stuck them together, forcing Isabel to be naked for it. The girls laughed after the naked red girl. After a minute, she finally separated her panties from her shorts. Stephanie snatched them choosing carefully which one for her prize, leaving naked Isabel, too tired to cover herself but still embarrassed. Finally she decided tossing her the clothing inaccurately forcing Isabel to walk over to it naked. All that Isabel had left to cover herself was...