Blasted by Sandman

Gwen staggered to her feet. Dazed, confused, and wearing ragged and soaked underwear. She was standing in the entrance hall of the school, which was fortunately deserted as everyone had evacuated. She gathered her wits and took a step forwards, her knee-sock-clad foot sinking weirdly into the floor.

"What?" Looking down, she saw the floor was inches-deep in sand. "Where did this come from?" She looked around, as if there would be a building site nearby that might have been broken to release the sand. She took another cautious step, wading through the sand. It had been a couple of inches to start with, but with her second step she sank to her ankle. With the next step, her leg sank to the knee.

"How is this..." became the latest question across Gwen's lips. Before she could finish asking it, she felt herself lifted in the air as if the sand were shifting, like something was underneath it, but as far as she could tell it was sand alone.

Gwen screamed as she was flung through the air, to land on a large pile of sand, which at least cushioned her landing. Gwen squirmed around to her back, feeling grains of sand getting everywhere as she did. She blinked in surprise as a column of sand rose up in front of her, and then flew in her direction, flowing over her chest and tearing her bra to shreds, freeing her ample breasts.

"No!" Gwen gasped, scrambling to her knees and turning to try and grab her bra, as another blast of sand hit her in the rear, shredding her panties and sweeping them away.

Then Gwen was lifted again, nude except for her socks, and flung through the front doors of the school, and outside.