You Oughta be in Novels

At Twilight's request, A. K. Yearling helps Stygian get into writing.

After the return of the Pillars of Equestria, A. K. Yearling gets a letter from Twilight: former villain Stygian is interested in writing. Not one to turn down a request from a princess and interested in learning from somepony who lived a millennium ago, Yearling sets up a meeting with him at a Canterlot donut shop. And so the two commence on Stygian's education of modern fiction.