She pulls too hard

Having almost got the front of the panties high enough, Sandry realised her rear was still completely exposed, as well as being the subject of a flattering commentary from the row of students behind her. She grabbed the back of the waistband with both hands and pulled hard.

"Come on..." she grunted, "Almost there..."

RIP!

The waistband suddenly shot up into exactly where she wanted, but Sandry felt she was still lacking coverage back there. Exploring with her hands, she found the large rip torn in the back of her underwear, allowing her entire rear end to hang out. This caused even more laughter and commentary around her, as her large, pale buttocks were impossible to hide now.

"Nice going, Blunder Woman!" one of thr meaner girls in class, Jasmine, called out.

"Sandry!" Miss Lane shouted over the noise of the class, "What is the meaning of this?"