Hope this isn't TOO old a thread to post in, but I just wanted to throw an idea out there and see what people thought. There's no way to do the "surprise" thing legally. Even if you do the non-con thing and then offer her X number of dollars to sign a release afterward, if she doesn't find the amount you're offering her to be sufficient, you're SOL. It's an insanely huge gamble.
So here's my idea: I don't think the OP really cares if the models know its coming or not, he just wants them to really really not like the experience, though I could be wrong. What about looking specifically for models who absolutely hate to be tickled with every ounce of their being, but for the right price and only for the money, they will agree to try and suffer through it somehow. The problems with this though are 1. if she hates it that much she's going to possibly demand more money than perhaps models are normally paid for a tickling video, and 2. if she agrees to do it, even if it is solely for the money, how much does she really hate it?
What say you, TMF Universe?
Edit: of course there's always the option of hiring a model who is a really good actress, having her pretend that she knew nothing about the tickling and present it as a legit NC video, say you paid her off afterward to sign the release, etc. In other words, do what TicklingParadise did and hope that too many people's bullshit detectors don't go off to hurt your sales. 😀