Oh wow, I repeated it.
This time I used my kitchen safe with a second key for the handcuffs as a backup release. The idea I could make it harder and if I could not pull the clamps away because of too much pain, there is an option to get free.
I prepare everything, put some clamps on my balls this time

and wait 15 minutes. During this time I wanked, it was a great feeling. I reached the edge and I was looking forward to be screwed. Then I put 30 minutes on the kitchen safe, that means I really do not want to wait that long. Then I clicked the handcuffs behind and throw the keyes around 2 meters away.
Suddenly I got an adrenalin kick, when I tested the handcuffs seconds later and I realize I have to feel horrible pain or wait 30 minutes with beasty clamps on my body to get free. Yeah that makes me cum without touching!
"Oh fuck". That makes it worse. I looked at the display of the kitchen safe. Still 29 minutes and it counts so slow. Post orgasm. I wanted to get free as soon as possible. I pulled the clamps on my thights fast. Then the clamps on my balls have to be done. I tried the first time and nothing happend but pain. Seriously I thought about every other option to get free. Looked to the display again and understood I can not wait all the time. I was totaly focussed to get free and there was really no joy. Did not expect it in that hard way and I was sweating too now. I had no choice and I pulled the clamps away with all the pain. Oh my god! What have I done, it was like hell and there are still marks on my body.
So as a warning. Be careful, even if you are totaly in lust to do it. But anyways it was great afterwards. I will not repeat it in this hard way.