Discovered

Sandry saw the girl's fingers close around the dropped rock, and then freeze. She was a few inched away from Sandry's toes.

"Miss?" Chloe said tentatively, "I think there's someone under this table."

"What? Don't be silly!"

"No, really."

Sandry jerked her foot back, which may have been a mistake, now the girl had seen her moving she was in no doubt. A moment later the tablecloth was whipped back, exposing Sandry to the class.

"Er..." Sandry looked around at the smiling students, all taking in the sight of her naked pink body curled up under the table, "I can explain?"