While browsing r/mlp i found an image by johnjoseco (currently the cover image of this story). It sent my brain into an overdrive, imagining what "the last of us" would be like with the cast of "my little pony", not a cross-over per se or a sequel, the actual story of "the last of us", just with ponies.
So after quickly mapping out what characters would fit what ponies and what characters needed oc's, (No kidding: the first words of this document are "o god what am i doing"), i wrote a ~1500 word story corresponding roughly to the first 15 minutes of "the last of us". This was the first chapter of the story you are looking at right now.
Contains massive spoilers about "The last of us" (obviously).