I have finally been able to master this. I had been trying for 2-3 years and would get close but not close enough. A couple of months ago I remember being 9 days without cuming and just using my mind to make me hard but then using my pelvic muscles to cause mini contractions. Sure enough, the feeling got better and more intense, to the point where I ended up having an orgasm in my underwear.
Now, I can almost do it on queue, assuming I have abstained for a solid week. I.e balls full of cum. I have also had an orgasm while giving a blowjob, hands free. No touching, just sucking and loading up my underwear with cum lol
the best part is when I cum like this, while fucking lush, I don’t loose the horniness. All it does is skim a bit from the top, to so speak. As in skims the horniness a bit, still a full ball load orgasm though