Get an old bicycle tire inner tube. At the air valve, cut the tube 2inches to left of the valve. Tie several knots on that end to make it airtight. To the right of the air stem, cut the tube 8inches from the stem. Tie several knots on tha end to make it airtight.
Using a hand air pump (or if you have an electric air pump), connect the pump to the air stem securely. Now shove the long end of the tube up your ass until the air stem is touching your taint (the area between your pussy and asshole). Using a standard single die, roll a number. This will be the number of full strokes on the hand pump or number of seconds (1 Mississippi count) you let the electric pump to run. That completes round 1. You will complete 10 rounds of rolling the die, inflating the tube the corresponding number of strokes or seconds.
When you've completed all 10 rounds, disconnect the pump from the tube while leaving the tube in your ass. You will roll the die one last time. The number it lands on will be multiplied by 10 for the total minutes you leave the tube in your asshole. Go for a walk in the neighborhood. When your time is up, you must yank the tube from your ass wherever you're at!
Hope you don't roll all sixes!
