First time posting in here, but a friend recommended this subreddit as a place that's good at finding obscure stuff.

I am looking for this piece of erotica on behalf of an acquaintance-friend, so I don't have much detail beyond what they've provided. They read it many years ago, and it primarily featured King Arthur, marrying and mastering Guinevere. Arthur was a bit cruel, enjoyed humiliating Guinevere, with elements of dubcon/noncon.

They said it's not a fanfic and was likely from before camelot/merlin TV shows. The story was one contained story, no chapters or multiple parts and was not formally published like a book.

A few scenes they remember from the story:

Guinevere wearing a restrictive and torturous dress, another scene with her restrained and exposed on her throne, through magic by Merlin, bondage on the Round Table, and last scene was of Arthur being annoyed because a knight came to tell him that a guest named Lancelot was there.

Anyone might've read this story before, or hints on where it might've been?

I searched bdsmlibrary, literotica and tried a bit of fanfiction.net, livejournal, and archiveofourown and plenty of Google but I'm at a loss for where else to look. I'm hoping someone might've read the story and knows more about it 'cause I'd like to read it too!