This story, apparently takes place in an alternate earth, similar to ours, where pony-girls (and presumable other bondage-themed activities) are much more prevalent and acceptable. Sort of similar to <a target="_self" href="https://latex-acolyte.deviantart.com/"><img class="avatar" src="https://a.deviantart.net/avatars/l/a/latex-acolyte.jpg?1" alt=":iconlatex-acolyte:" title="Latex-Acolyte" /></a>'s webcomic 'Collar 6' or <a target="_self" href="https://pornwriter.deviantart.com/"><img class="avatar" src="https://a.deviantart.net/avatars/default.gif" alt=":iconpornwriter:" title="pornwriter" /></a>'s New Lesbos setting, I don't know. I was just writing, decided to throw it in...