Give me 100 sympathy strokes again. You're doing better than expected, slave.
Now, my favorite form of punishment, especially when applied by a slave to himself.
Punching is an incredible form of punishment. Instead of slowly increasing pain with each second or blow like slapping or squeezing, punching quite often delivers the pain on contact. A blow of above 60 psi can rupture your balls, but you cannot reach 60 psi while trying to punch your balls from the front.
Now, explore this. Give me one good punch to your balls.
Notice how the pain shoots the second a knuckle makes contact?
Give me one punch as hard as you can, no holding back.
How did that feel? Good. Give me 10 more! You should be focusing on accuracy, while increasing the force with each blow. Give me 10 in repetition like your were punching a speed bag. Dead time will ruin any progress you are making.
Good. 50 strokes, go.
Perfect, now that your balls are awake, and your feeling the pain searing through your gut, I want you to pull your balls to the end of the sack. Wrap your hand around the sack between your balls and your cock. Now deliver 5 hard punches to your balls while they have nowhere to go. Do not use all your force, but enough to double you over after each blow.
I want to see you collapse in pain.