I know I read it on here.
There's some kind of witch or something traversing a mountain when she comes across three centaur girls who are harassing a cafe. She spikes their food, causing intestinal duress to two of them, while telling the last one she has to catch every last bit of it on a tray or she'll poison her too
Anyone have a link to this?
It's called "Transference" and it's written by the very talented BlueSniper. Just search for it in Nyou Fiction, and you'll be sure to find it. But in case you can't, here's a link: http://nyou.animegirldesp.org/nf/viewstory.php?sid=880&chapter=1. Hope this helps.