Interesting to hear about the urethra kinking while seated, but surely it's the bladder muscles that control peeing? pardon my ignorance ,,,
Anyway, I do feel less urge sitting upright than standing,,,
When I do a planned wetting, I'll watch TV, drink water or beer, sitting in my armchair. I don't try to hold, or try to go, just sit relaxing,,,
I do feel some pressure after an hour, I ignore this, after about another 30/45 minutes I'll lift my legs, bend at the knee and put the soles of my feet together, also slouch. After about 5 minutes I'll leak a little, then maybe a minute after that have an uncontrollable flood that feels amazing, the build up is really sensual, similar in feel to a big ejaculation but without the orgasm if that makes sense?
But next time I might stand up after the first little leak, I'm keen to experiment lol.