She's warned

"Um, Tanya!" The Asian girl in the front row suddenly says.

"Having trouble?" The Teacher - Tanya asks, looking across at her.

The girl doesn't actually say anything, but instead points silently at her exposed panties.

It takes Tanya a moment to look down, her eyes suddenly taking in the two halves of her leggings around her ankles, her white panties on full display to all five members of her class.