She pantses Sami

"Sorry Sami." Allison said as she lifted her friend's shirt and grabbed the waistband of her panties. "I have to prove this to you."

"What the-" Sami managed before Allison yanked the panties down to the ground.

Allison gave her a gentle push forward, forcing Sami to step out of them. She whirled around, hands covering her bare crotch as she stood at the edge of the school running field wearing just a t-shirt and bra.

"Allison! What are you doing?" she demanded.

"Proving a point." Allison replied. She picked up the panties and edged past Sami, so that she was nearer to their clothes. "We'll play a quick relay."

"What?!"

"I'll run with your panties held behind me, like in a relay race. If you can catch me and grab them-" And, Allison thought, prove my point in the process since I'm usually faster. "-then you can get dressed and we'll call it a night. If you can't, then you have to run the nude one hundred metres for me."

"I don't know..." Sami said hesitantly.

"It wasn't a choice." Allison said with a grin as she turned and started running.

For some reason, the adrenaline rush didn't kick in like it had before. Perhaps it was being nude for a prolonged time had made it seem more normal somehow, or maybe it was the flush of guilt she was feeling at doing this to her friend. Either way she knew as she was running, breasts bouncing wildly and one arm held behind her with the panties, that she wasn't being nearly as quick as she was before.

"Alli!" Sami cried, not far behind her.