[Sex Speed Runner]

An idea could be:

Go to the local park or somewhere you are happy to strip naked in just a dress and take a bag.

Find somewhere comfortable with a chance you will be caught, and take off an your dress. Put it inside your lock box and set it to 1 hour and put the lock box in the bag, leaving it around 10m from where you are.

Now insert a vibrator on a setting that you could cum from multiple times within the hour. Now blindfold yourself and put on some headphones so you cannot see or hear anything. You will stay like that for as long as you dare, if you stop before you cum you may not cum. If stop before the time is up you must make you way home as you are, you can ask someone to pick you up, but whats the fun in that.

The idea is that you must be made to cum multiple times before you are allowed to redress, or you go home naked.