Pulls off Isabel's bra as well

(chapter originally by worlddominator at writing.com)

Heather sinks her hands on the sports bra from behind and detaches it. Isabel tries her hardest to keep her bra from being taken but, Kelly starts to tickle Isabel a bit, causing Isabel's grip to loosen and the bra was snatched. Isabel immediately went to cover her now bare breasts.

"Isabel, you seem like a natural at this." said Kelly, " Maybe we should up the ante."

"That sounds interesting," said Heather, "What do you say, girls?"

Stephanie agreed to it confident she could easily beat Isabel in this state.

Isabel wasn't so sure, and asked, "what changes do you want to make?"

" A simple bet," said Kelly, "Its the same challenge but, Isabel puts up one of her remaining clothes as a betting piece. If she wins, she gets back her clothes, but if she loses, she gives up that betted article of clothing right on the spot."

"Of course, if you don't want to take on this bet," Heather said, "We'll just keep the clothes that were taken from you. We also might not be able to stop any further changes to what you're wearing."

Isabel considers this carefully. On one hand, she is almost certain to lose this challenge now, but she wasn't sure if she could handle the onslaught from her two friends.

Isabel decides to...