I am looking for an old story about a writer who is a guest at a mansion.
He meets the niece of the lady who invited him but she is kept in rubber bondage almost permanently.
I remember one chapter where the niece baits him into a bondage cape and locks him outside in the rain.
Ring a bell for anyone?
This one, maybe?
The Ultimate Challenge by dianag
https://www.boundstories.net/storiessz/ultimatechallenge.html (https://www.boundstories.net/storiessz/ultimatechallenge.html)
No, I think I know the one you're thinking of, definitely a male protagonist. It was on the Staylace (https://www.staylace.org/) site I think, a couple of chapters long. Can't remember the title or more details but if you hunt around on that site you should hopefully find it. If I have time later I'll hunt around with Google Site Search on it.