When I was a small kid, I had a couple of "Where's Waldo?" books with tickle torture featured in them. I wouldn't try to find waldo on those pictures; my eyes would wander, but I just kept coming back to the tickle torture. I was completely fascinated with it. There was no limit to how long they were being tickled because it was an image forever frozen in time.
Just a tad bit later in life, the Teenage Mutant Ninja Turtles had not just one, but three separate episodes where tickle torture was a plot point. Not many people even mention the third one, yet it was the most influential to me. First there was "Case of the Hot Kimono" where April O'Neil (Hot) and Vernon Fenwick (Total buzzkill) got it when they were interrogated for the whereabouts of a special kimono with a treasure map cleverly sewn into the fabric. Then there was Zach and Caitlyn in "The Great Boldini" when they were interrogated for where they hid the Turtellini Emerald. Then there was "Burne's Blues" where Burne Thompson and Vernon Fenwick had wild misadventure into the world of tickle torture. Seriously, they get kidnapped and tickle tortured no less than three separate occasions through out the episode and one of those sessions went for three hours straight, yet they showed no signs of ill effect.
I can't even begin to fathom being tickled for three hours straight, but this didn't stop me from thinking of even longer ridiculous amounts of time to be tickle tortured. My earliest childhood fantasy was that I was kidnapped by evil alien overlords, which looked suspiciously like cartoonishly overly muscled humans with executioner masks on in my mind, that wanted to test the extreme limits of the sensitivity of the human nervous system and I was the guinea pig. It wasn't just me either, they kidnapped an entire building worth of students from my school. Anyways, when they kidnapped us, they employed a reverse stasis field that froze time everywhere else in the universe. We perceived time at it's normal rate, only we didn't age, we never fatigued and we never needed sustenance or sleep. We were essentially a self sustaining force of perpetual energy.
I think it's rather odd that I had understood such alarmingly technical knowledge about temporal mechanics at that age. I also had a bizarre fascination with impossibly huge numbers, wanting to know precisely how big forever was and was bound and determined to find out. At any rate, the evil alien overlords tickle tortured us with various tools and implements specifically tailored to get the biggest reactions out us. Since we didn't fatigue, we were forever stuck with the feeling of the first minute of tickle torture. This would go on for hundreds of billions of years until they would stop and give you a break for a few millenia while they compared notes from other specimens. The next thing you know, the tickles came back with a vengeance and the intensity becomes exponentially worse.
I eventually became the hero of my story and valiantly kamikaze'd the temporal core reactor of the evil alien fortress-like space ship, saving everyone from their tickly fate. The resulting blast sent me hurdling through the fabrics of space and time, forever lost to cosmos. I used this as an excuse to essentially insert myself into any entertainment universe I fancied and role played with myself, going on many bizarre misadventures in my own demented tickle land, slowly building myself up as an all powerful supernatural entity that would put goku to shame.
So yeah, it was an amazing, beautiful and needlessly convoluted place inside my head back then. The biggest influence on my tickle fetish fantasy happened when I was in the sixth or seventh grade when R.L. Stine wrote a mini-pamphlet story called Don't Make Me Laugh. It was about this pair of schoolyard bullie/class clowns (brothers maybe? It's been a while since I've read it) who would catch other kids, pin them down and tickle the crap out of them. Then one day aliens kidnapped them and demanded to know the secret of how they made people laugh. Turns out the aliens weren't ticklish and the boys were promptly executed for their failure.
As you can see, I took (read: blatantly stole) the best parts of these three sources and turned them into it's own unique and awesome amalgamation custom fit to my imagination. I also have a minor foot fetish, but I'm just attracted to the curvy shape of them. I like to imagine what the reaction might be like if I were to tickle them as well, but that's about the extent of it. Although I've never had a foot worship fantasy of any kind, I personally think feet are just as sexy and distracting as boobies. Boobies are much more fun and awesome to play with though. So there you have it, my fetish origin story! I hope you enjoyed reading it!