Magic Hands
When I feel you getting to the edge again, I circle your balls with my fingers, and get a nice, tight grasp on your scrotum and squeeze there like you have a ball stretcher on, so that the pressure really starts to build up in your system and I pull your balls out and away from your body. Then, I start jerking up and down on your cock as hard and as fast as I can. Every time I slam my hand down on your cock, I smack your balls.
(You can cover your balls with your hand, but you should be gripping your scrotum right at the base of your cock so that you can pull your balls out and away from your body.)
I figure that you can only take about two minutes of this before I make you cum, but I'm going to bring you back from the edge every time that I sense you are going to cum, so that you get a full 5 minutes of this! I want to see a real big load come out of your cock!