Over the last few weeks, I've been exploring nipple-clamps, and it has gone really well. At first, I had no major sexual response, but now, the discomfort feels very sexual. Here are some things I have tried.
Disclaimer: take care. my nipples are small, and the strength of clamps may vary!
Timing and Rotating
I find that, after around 5 minutes, I can see that my nipples have compressed. Then I remove them, rotate by 90 degrees, and re-attach them, so the nipples are compressed in the other direction. This increases the discomfort. After say 2 minutes, repeat the rotation - it gets worse. Note that the clamps should be re-fixed quickly, in say 3 seconds.
You might do this 4 times.
This depends on your nipples, sweat, and clamps - it might not work for you.
Try to pull the clamps off, slowly, making it last around 30 seconds. You might be able to see the clamps moving slowly, if you look close. I do not pull quickly, do not want to risk damage.
Try this 3 times, if it works for you.
In all these things, make a pact with yourself to do it - do not cheat yourself out of the experience!