it involves a warehouse party with two girls in costumes, one's in a steampunk outfit with a fetish gasmask and cop friend, there's a stage crasher and he casts magic that sends lightning that changes people into their costume
the newly changing gimp goes into the bathroom, the guy on stage gets killed by cops and both girls live their lives together looking for a way to reverse the magic
not sure why it's so hard to find
I read this story before.
try starting searching the Halloween stories first
then search keywords
Also check Gagged utopia too.!!
You may know this but just in case you don't, there is a special section of the main page for the Halloween Specials (https://grometsplaza.net/special/halloween_stories.html) If the story was submitted as part of that annual event it may be easier to find from there
I think the search function is your friend here:
Halloween Stories only (https://grometsplaza.net/search.html?site=17), and suggested keywords of magic, majick, transform, costume, party.
Try this one it's close.
https://grometsplaza.net/special/halloween20/halloween_carnevil.html
i tried to search the Transformation, latex and the Halloween for this story but I can't find it
I think you mean this story
https://www.deviantart.com/jeffapr202006/art/Halloween-Party-Mishap-837741209
Well found!