I think you're thinking of one by @zillman but they seem to have deleted all their stories unfortunately.
There's an off chance it could also possibly be this: https://grometsplaza.net/world/machine/storiesad/catherine_getscleaned.html
A collection of my favourites (all /f and nsfw)
Knight/Wingman
Sirens' Rapture: The Machines
BARBARELLA: THE FEATHERTRAP
3T3
ML Nanotech
Anger Management
ktulu
Ticklomatic
An Evening at the Gallery
The Litterbug Series (part 1, part 2, part 3)
The Punishment of Kira McKee
Giggle Box V.02
http://tangible.media.mit.edu/project/cilllia/
I'm sure you guys can imagine the possibilities.
What would you make with this? What would you use it for?