The story picks up when Twilight was returning to Ponyville after visiting with four of her old friends from Canterlot. This leaves just Moondancer, Twinkleshine, Lemon Hearts, and Minuette to hang out until Lyra is scheduled to arrive.
Moondancer wasn't always the closest with these three, so she ended up missing out on some pretty important events. Fortunately for her, they're more than happy to share a story at their favorite donut place.

All of this is based off of headcanons I developed looking at information I found in the Wikipedia entries for these background ponies and what little we've seen of them in the show. Also, I was a bit confused as to how I should tag this story. If you think a tag should be added or removed, please say so in the comments or PM me, thanks and I hope you enjoy. It's not necessary for the first chapter, but here's a link to the original story this branches off from.