Looking for a story where a human is turned into a pony and goes through heat

I know of a couple that never made it to fimfic:
How I Learned To Love Being The Mare In Heat
Anon is a Mare in Heat (Part 1) (Part 2)

The only one I know is the slow-changing one called unexpected changes. Sadly it has not been updated for a long time.

I think your best bet is go seach around in /mlp/

Alot of anon clop oneshots on this site was a green text before, according to author.

https://www.fimfiction.net/story/357734/darrens-journey-through-estrus-season