So this is a fairly personal and embarrassing story, but fuck it, I'll indulge in some anonymity.
Basically, I have been on a medication since I was maybe 10 years old that fucks up your libido and ejaculation and whatnot. I remember being 12 or 13 years old when I first google image searched "tickle torture" and then proceeded to just stare at the shitty mspaint depictions of what I didn't fully understand to be my fetish at the time. I'm not sure what it's like for a normal hormonal little freak, like maybe you just instinctually gravitate towards wanting to pleasure yourself to what you see, but I didn't have any kind of reaction like that. I remember at some point I realized I was supposed to be actually masturbating to porn, and I tried for like an hour but just ended up with nothing but a sore wrist and a moderate amount of frustration.
Anyways, I gave up and assumed it would never happen, until about a week after my 18th birthday when I got all determined and decided that I was going to aggressively jack off until I came. I put on a video that was just called "gagged tickling" and hit play. Apparently, my body had changed a lot and I had no clue, because I lasted maybe 2 minutes into the video before it happened. I had no clue that it shot out, so I got all messy. I then went and took a shower while kind of freaking out. It actually made me angry initially, like it had been hyped up and was a let down to finally experience. Despite that, I did it again the next day. Anyways, thats my weird personal story that only half relates to tickling.