Her skirt rides up

Sandry began her presentation nervously, and only got more nervous as she shuffled the papers in her hands and two of the sheets slipped through her fingers and fell to the floor.

"Whoops!" Sandry said, looking around for them. Turning her back to the class, she bent over to grab a page.

She was greeted by the sound of laughter and catcalls.

"Sandry!" Her teacher exclaimed, "That is not proper behaviour for a young lady!"

"What?" Sandry suddenly realised that when she bent, the hem of her skirt had ridden up past her large backside, gathering at her waist and revealing her light pink panties like a curtain rising for a play. "Sorry!" Sandry gasped, she straightened up but the skirt remained bunched up however hard she tried to pull it down again.