Its a very cool feeling of having a VERY BIG melon attached to your body. You have the balls of a bull and the saline solution is like an airbag. If you get a punch in your balls, you don't wimper
All you need is medical practice, STERILE equipment and a hopefully sterile environment. Its important that you work precisely and sterile...
You have to buy sterile saline solution in a bag for intravenous infusion, an intravenous kit and a butterfly needle, and alcohol for sterilization. But if you want to do this, there are other forum platforms, which will take care of the procedure. You can PN me, if you want to know more.
But back to the topic.
You can also infuse saline solution to your breasts which gives you a nice pair of tits. But its more painful than an infusion for the ball sack. The ball sack is a big skin cavity compared with the breast tissue. When the breast tissue gets filled, the different layers must be separated. And thats what makes the pain...