I'm really enjoying how you're writing this. I enjoy that Allison isn't being tortured non-stop, but is having the threat of tickling used as a way of controlling her.
If I may make a suggestion: When you're done with this could you put it all together in a single post? I was initially hesitant to check in on this again after reading the first part because I didn't realize that the story was being continued later on down the thread. Putting it all together after you've wrapped it up would be a lot more convenient for the reader than having to scroll through to see if they've missed anything.