AI Smut Writer review
AI Smut Writer has a story mode for drafting and revising fiction and a separate chat mode. Its public help describes how to return to a draft, ask for a different passage and save a text copy from the dashboard.
Revise a passage before you extend the story
The FAQ says you can ask the writer to rewrite a section, add detail or continue in a new direction. The dashboard saves stories privately unless you publish them. The terms require adults and prohibit material involving minors, non-consensual sexual activity or real identifiable people used without consent. They say you retain ownership of your prompts and inputs.

Save the text and watch the balance
NovelAI documents browser-side encryption for saved stories. AI Smut Writer instead emphasizes copying or downloading story text from the dashboard for offline use. Its FAQ advertises six free credits a day and says costs depend on the feature and model. It gives a two-credit minimum balance for sending a SmutChat message.
Anabel’s take
I'd finish one revision and save a plain-text copy before asking for another version. That would keep the draft easy to move, and I'd know which mode I wanted to spend the next credits on.