Two girls decide to enter a fetish/latex store. and the clerk asks who is the "slave" and one girl is quick to answer. "Me!!" And the begin to dress up the other friend.
I'm trying to remember the name of it, I have a feeling that there was one where the question was who was the Mistress and it developed from there.
Oh Come On It Will Be Fun! (https://www.utopiastories.com/code/show_story.asp/recid/17490) by Katie D?
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hollow.well
That's the one I was thinking of.