This is your punishment.
Using a wide rope or a sock, tie a knot around your balls with the knot on the back and make another knot around the base of your cock. Both very tight.
Now go to
http://www.metronomeonline.com/, set it to 40: this is the pace you must jackoff.
When you are on the verge to orgasm, strengthen the knot to ruin it.
Do not masturbate or cum before you get another dare or you decided to start one over again.