Get a dildo (or long candle) and wooden ruler.
open in new window : http://www.metronomeonline.com/
Set to 40.
Now you are going to fuck your dildo.
Every minute you increase the metronome 1 step.
You are not allowed to cum.
In case you are close, then stop and put an ice cube in your pussy.
Take the wooden ruler and spank your pussy 5 times : each spank harder.
Then start again at the speed you were stopped.
Go until the metronome is at 100.