Loosened panties

As you watch her run you click your fingers, increasing the size of her panties by one, just enough for them to slide a little down her hips.

Sophie stops frozen in place as she feels her panties slip. Having already lost her shorts, losing her panties as well is completely unacceptable.

Keeping one hand on her panties helps, but that means hiking up her shirt enough to have her underwear on clear view to anyone who came past.