Compound the problem

"Maybe we can just pin them to skirt." Steph suddenly says, dropping her school bag and beginning rummage inside. "I'm sure I've got some pins in here somewhere."

Yasmin suddenly seems perk up as friend produces a single safety pin her bag. "That would be awesome, thanks." Yasmin tells Steph as she steps back into her panties, pulling them up under her skirt.

Steph kneels behind her, grabbing at the panties and the skirt with the pin before you decide to intervene.

A click of your fingers and the pin snaps, going straight through the clasp of Yasmin's skirt, both skirt and panties dropping to the floor leaving her bare arse on full display to Steph behind her.