Best known as "Maddie Fay", there's an author who has been writing chastity and femdom captions for years . . . but who keeps moving around between various websites, tumblr, Twitter, and more. Also known as Sissy Mistress Maddie Fay, and The Mad Eroticist, its not easy to follow him around the web. And he periodically deletes all his old material. In light of that, I thought I'd post some of his material here. He's done some very good work over the years, and its worth a look. (And if anyone knows where he's currently posting, please post it here - I've lost track of him recently)
One of his longer stories, Maddie Fay released this version of Mistress Alyssa looking for feedback. It follows a woman as she chastizes (and occasionally feminizes) every guy in her path.
However, Maddie Fay is probably best known for his photocaptions. Probably 90% of his work is set in a gynarchy, or at least a society where the suggestion of locking a guy in chastity isn't unheard of. (Mods edit - captioned photos turned to links where there is any text input from the OP, otherwise picture only posts have been deleted - apologies, but currently they dont belong here)
There are more stories floating around there, but I'm not sure I have copies. I know Maddie Fay did several short stories set in a femdom version of Wonderland, and I think he also wrote "Alimony" (posted in this thread). But he's really best known for his captions: (mods edit - more images deleted - again, apologies)