This story is a sequel to Diplomacy through schooling

Fourth in the Diplomacy-verse, and a part of the greater "Powers-That-Be" multiverse. Twilight Sparkle's had an interesting year and a half since meeting Swift-Pad, the diplomat from the Packlands. She's made new friends, she's traveled the world as a diplomat and learned a great deal about the other societies in the process, and opened a school to teach friendship and world cultures... and she's also seen the permanent downfall of two tyrannical enemies. Now, she's just looking forward to a peaceful time of teaching and enjoying life, while training to get her new powers under control.

But there's more to life that's coming her way. New travels, new dangers, new and exciting surprises. For a diplomat's duties are never done.

Cowritten by Evilhumour and Anon e Mouse Jr.. Tropes page for the Diplomacy-verse here.

This story is a sequel to Diplomat at Large

Third in the Diplomacy-verse, and a part of the greater "Powers-That-Be" multiverse. Twilight has returned home after nearly a year, and has a new mission in mind: the formation of a School of Friendship, in which creatures of every species can come to learn the values and methods of friendship, and about the cultures of the different races that make up their world. 

This story is a sequel to A Diplomatic Visit

 Second in the Diplomacy-verse, and a part of the greater "Powers-That-Be" multiverse. As Twilight Sparkle begins her travels around the world and seeks to mend the divides between the nations, friends old and new have their own adventures back home.

Shortly after Twilight’s ascension to alicornhood, Ponyville receives a guest from the wolf packs of the Packlands, the diplomat Swift-Pad, who has come to meet Equestria’s newest princess and teach her a few lessons of his own.

Another work with Vinylshadow and Purrs (Chapter One) and Anon and Tangent(Chapter Two upwards)