Take a condom with a reservoir tip, and fill the tip of the condom with a water-based lube. (The more lube you use, the better it feels.) Once the condom is nice and snug at the base of your penis, squeeze the tip, so the lube gets squished around. Then start to masturbate.
THE SLIDING CONDOM
Take a condom and put quite a lot of lotion in the tip. Then roll the condom down on your penis, and squish the lotion between your penis and the condom. Now slowly slide the condom almost off and back on again. When you get going, pull the end of the condom with one hand and then slide it back on with the other. Once you get the technique down, it will feel like your penis is a foot long as you slide the condom up and down. Then, when you approach orgasm, squeeze hard, hold your hands still, and thrust with your hips like with the "Vagina" method for a long-lasting orgasm that will milk you dry.