If this isn't a post-credit scene in Legend of Everfree, I'm going to be sorely disappointed.

Even if its just implied. Here's just some fanfiction.

Twilight and Sunset are walking the halls of Canterlot Castle, Sunset determined to reach the throne room and apologise come hell or high water. She briefly loses her nerve at the closed door, and Twilight watches silently, taking a step back as Sunset opens the door to the throne room, wherein a shocked Celestia is filing paperwork. Celestia drops the paperwork and stares at Sunset, mouth agape.

After a pained silence, Sunset smiles, tears forming in her eyes. Celestia reciprocates, and the screen cuts to black.