Hmmmm, seeing you do that is starting to make my juices flow. Can you rub just the head of your cock till you feel like your going to cum then let go and let your self recover.
When your in control again begin to stroke your entire cock up and down 100 times. 50 with one hand and 50 with the other and whatever you do, do not let your self cum or even come close to an edge. You got 50 seconds to do it. Start.