Well, “The Night That Never Ended” was the first (and still my favourite) fic. It hasn’t been updated in almost year though, which is a shame since it was nearing the climax. Being the first fic of its kind that I started reading 2 years ago, it hit me pretty hard back then.
As for other stories I’ve enjoyed:
The Party Never Ended - My first shipfic, which was surprisingly captivating, while the ending was
unexpectedly steamy, since I wasn’t familiar with ButterscotchSundae’s past works.
Pony Psychology Series - Dark romance, an even darker sequel, and the most badass Derpy interpretation ever. I was hooked.
Arddun Lleuad - My first taste of “A human in Equestria”. I’ve read very few stories that are based around that happening, but this remains my favourite.
Yours Truly - Feels. Feels everywhere.
A Delicate Balance - My favourite ship. Very well written character interaction and a joy to read.
Tabluna Rasa - It’s one of those fun stories that leave you feeling satisfied once you’ve finished. Pinkie’s chapter in particular was excellent.
Alicorn - The sequel to Mommy Nearest (which wasn’t all that great), but it’s so engaging while going from a feel-good story that’s somewhat lighthearted, to dark and filled with disaster. An epic in the making, but it’s rarely ever updated.
The Ballad of Twilight Sparkle - This is how Twixie is done right. With rafts of comedy, teasing between characters and other ships that develop during the story. I also keep telling Gravekeeper to get another chapter done, but he’s either busy working, talking to me and a bunch of friends or just can’t get in the groove.
@Feral_Socks
I actually talk with CoffeeGrunt on an almost daily basis. I remember them saying just before they uploaded the first Allegrezza chapter that they weren’t taking it too seriously. Then its popularity unexpectedly exploded.
It’s certainly an enjoyable read though, which develops steadily while being fun throughout, but VST is my favourite VinylTavia fic. It’s simply hilarious and the character interaction is awesome.
@romantiCaveman
I think I had “Naked Singularity” bookmarked a year ago. Never did read it in the end. :/