Over the next few days, Twilight pours all her effort into getting several hundred more houses built while the Crystal Ponies continue to stay in the Palace of Friendship. While she's busy helping build, Twilight gets another letter. This time it's one from Empress Rightheart of the unicorn kingdom of Mount Reinus. "Dear Princess Twilight of Equestria," reads Twilight, "our kingdom has fallen victim to a radical group of dragons. They've destroyed everything. Can we receive some aid? Or at least, can we come to Equestria, to your castle, until the dragons are dealt with? Sincerely, Empress Rightheart." Twilight promptly pulls out a scroll and writes a response.
"Please come," writes Twilight, "you are free to stay in my castle while I send some of our best warriors to deal with your dragon problem. Sincerely, Princess Twilight." She then uses her mail sending spell to send the letter to the Empress, who immediately once she gets it, reads it and readies her people to head to Equestria.
A few days later, they arrive at Twilight's castle, and Twilight happily provides them with blankets, pillows, and a nice meal before she lets them head off to bed for the night. Once they finish their food and head off to bed in the library on the floor, Twilight returns to the main part of town and helps raise a new insignia in the town square: one of her defeating Daybreaker and Nightmare Moon. She is honored, but she knows it is still going to take time to rebuild, especially now that she has so many ponies that are relying on her for food and shelter. The next morning, Twilight wakes up bright and early and brings around a breakfast of freshly made corn muffins to the ponies, who happily down at least a dozen each causing Twilight go off to bake more and bring them out once again, this time steaming hot. They then happily down the second batch and then even a third and fourth batch. Twilight is glad she can at least feed them and give them a place to sleep until such time as the houses are built.
A few weeks later, all the new houses are built and the crystal ponies move into theirs and the Empress's unicorns move into theirs as well. As for the Empress, Shining Armor, Cadence, and Flurry, they continue to live in the palace alongside Twilight. From there, the five rule all their subjects together. Things continue to be on the up and up for them and for that, Twilight is grateful. Now, all she has to do is manage to keep a steady temperament now that she has to share her ruling responsibilities with four other ponies.