Remove her panties.

You do it in fits and starts, to make it just that little bit more excruciating for the poor girl. Her red panties slide down her milky thighs by just a fraction of an inch, exposing the merest hint of ginger pubic hair. Then another fraction, and another, as you slowly tug them down bit by bit. To the wench it feels as if they're sliding down of their own accord. With her hands tied she can't do anything to stop it, of course. You can see her sweat as she stares straight ahead, desperately hoping you won't notice her newest wardrobe malfunction, quite unaware you're the cause of it.

But wait. This could be even more fun. You take a couple of small pebbles and tuck them into the gusset of the panties, where she can't dislodge them by moving around. Then you stand back and watch her face as the newly heavy undergarments slowly creep down her legs, exposing her pretty pussy inch by teasing inch. It only takes a few minutes, but you can tell it seems like hours to her.

Some critical moment is reached and the panties slide halfway down her thighs in the space of a single breath, bunching around her knees. "Hey, I can see your pussy," you say to her, feigning innocence as she squeals and sinks to her knees. "Nice! Did you show me that on purpose?"

"What? No!"

"Cool. How did you get your panties off?"

"What?" She looks down and sees that her panties have vanished entirely. You hold them up where she can see them. "Thanks! What a lovely present."

"Give those back! No! Eek!"