Oh man... There are a lot of stories I don't tell here because of the young people involved. My fetish was triggered at age five when my babysitter's friend pinned her down for me to tickle. That led to playing tie up games with friends at a very young age, and as I got better at it, plotting tickle pranks with those friends on big sisters, other babysitters, etc. Once, notably, a friend and I got his mom.
By middle school and through high school, tying and tickling was solidly in my "fooling around" repertoire, and most of my peers knew about it in a fun sort of way. I'd get enlisted when someone lost a bet or a game or during wrestling matches to administer a session of tied-up tickle torture. My friends even had a name for it: a "Bohemian Slow Death," or BSD for short. No idea where that came from.
I think growing up with it like that and having the offhand acceptance of my friend group took the edge off of ever feeling weird about it.
But bottom line, OP, yes I've had lots of experiences where older sisters or other authority figures were overpowered (or pranked) and tied and tickled by younger kids or siblings.
That's quite the interesting list of experiences, no wonder you started making videos too.