Apparently you've never seen a looong post!
The best tickle stories I've ever seen were Tabitha's Tease and Tabitha's Tickle, by Robin Wilde and published by Masquerade Books. They go in and out of print, so could luck finding them. Since you don't like male/sub stories (I usually don't either), you may not be interested, though there is a fair number of females being tickled, in addition to the ones who are doing the tickling. Between the two stories, they're about 500 pages long, so there's quite enough to keep you (er, me) happy.
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