I never understood why Writing.com is so dogged on making people pay, especially for being able to add three options or more and including more stories. I mean, I could understand if they actually did something, even provided maybe scenarios, but as I understand, it seems they only host the site. I'd consider "donating" some to help the site make some money, but limiting my choices and blaring me with ads that can't be blocked when I am the one providing the content people are coming to see is baffling.
"Hey, pay for this service."
"Okay, what do I get?"
"I'll let you add even more content to my site!"
As for a new place to add to our favorite fetish stories, especially interactive, our options are limited unless someone here wants to fess up that they're a coder.
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http://infinite-story.com/
As for this, if it makes you make an account to see anything, we're already shooting ourselves in the foot. We've a nice little community here, but we always need more authors and retreating to a super secret and exclusive site only serves to wane our numbers.
http://www.protagonize.com/
I don't think we'd be welcome there. Although, from what I've seen, sex is rarely if ever in our stories, there's many times of masturbation and an undeniable erotic tone to it. As you have, I couldn't come up with anything. I searched and the worst I found was the implication someone might engage in coitus at a later time and they drank some alcohol. I think it might be aimed at highschoolers trying to find a niche in writing rather than a horde of perverts as Writing.com is.