Alright time for my 4 cents....(Inflation, y'know)
I first came up on the concept of a pony girl via John Willie. There some great stories that he illustrated, all wasp waisted women in harness, pulling elegant carriages, singly, in pairs on in teams of 4.
They might not have started out enjoying it, but all the ponies in his stories love being a pony. They have strict but loving owners, who treat them as you do a thoroughbred horse.
I read a lot around that, found the art of Micheal Manning, and loved some of what he showed in that.
I also found a lot of stuff on the general beast of burden style. A poor unfortunate forced to drag a mine cart, a wagon, a plough, whipped at every opportunity, and I've written plenty of stuff that features that.
All of these hit a lot of my major likes, slim, well muscled, flexible lasses with small tits. Add in sweat and you're at my ideal. If that sounds like Wenona
@captivecuties, then you've hit the nail on the head.
The Widower was my first turn at a story of the first type, and it honestly fairly flew out of my head and into the page. As is the second, though that's now at the point of the pony side being done, as I explore how far Luci's masochism and submission goes. I even have a germ of an idea for a third part, fed by ideas from Danielle Richards' 'The Ultimate Whipping' and her heroine Lani. (By the way, if you haven't read her Lani series, go look them up. Well worth it!)