Like mentioned. I remember having it in my favorites but its since gone missing. if been trying to find it with fimfetch and google searches but haven't had any luck. I don't know if I'm just misremembering the name (Belle Desír?) or not. I don't know the authors name but do remember most of the story. it's summarized as so:

-Celestia sends twilight out of the castle for the day because she's cooped up.
-with not being too familiar with Canterlot she unknowingly ends up in the Redlight district.
-upon entering a stripclub she encounters the club owner and someone in an altercation.
-She talks the owner down and he realizes who she is.
-owner decides to give her a private show with their best dancer as an apology for having to see said business being conducted.
-finds out it's Rarity. Rarity tells twi to stay hush-hush about it to their friends. dance and other stuff happens, story ends.

been looking everywhere i can think which might give a lead, but haven't had any luck so far. Anyone have any information about it or any ideas on finding it? the cover art used was foxinshadows rarity pinup i believe.

641616 on derpibooru for reference.