Put a clothespin on your clit

A strategically placed clothes peg and your world collapses onto one little nib of flesh, everything else fading into meaningless obscurity, like being sucked into a black hole, gone, vanished, all you thoughts now focussed on one tiny point of the universe....

You show her a clothespin, and grab her clit gently between your fingers. Her eyes widen, as you carefully place the clothespin on the tender foreskin of her clit. She has to keep it there, until you allow her to remove it.