This is an old favourite of mine. It can only be enjoyed, raptuously, by those who like me, have small cocks, 4 to 5 inches when fully rampant - a big reward for the little guys. Get it up and really hard, busting for relief. Unroll a condom (I prefer a flesh coloured one) down your length, which does not fully extended it, pull the tip up, so that the sheath slides nearly off. You can now roll down to the ring at the end of the condom. Slide it all back onto your cock, now stretch the ring over your scrotum, yes it will, and you have all cock and balls held tightly in the latex enclosure. Now you are ready to climb to paradise. Stroke your cock as usual and your balls are tugged gently with each motion. It adds to your mounting fervour. When the fulfillment can no longer be denied, your spurting convulsions will delight your eyes as the tip fills.
Those of you who can do this will do it over again, as I have for many years.