If you feel you're about to cum you have two choices:
1. Stop for a minute and spank both your balls 10 times.
2. Cum! but be sure to collect all the sticky icky goo that comes from your weener. When you're finished wrap the shoelace around your ballsack so that your balls are being pulled down frimly. Then put a clothespin on each nipple and four around them. Put five clothespins on your inner thighs and spank your balls 25 times. When you're done spanking, rub your weener juice in your hair, pull off all clothespin with out opening them and don't come back for a week... Oh, and also stick your finger up your pooper and then rub it under your nose. That's for pooping my fun.
I suggest you stick with n°1.
Now, stroke untill you're hard. Conitue when you're ready.