This story is a sequel to Past Sins

Hearth's Warming is a time for friends and family to come together, celebrate harmony, and welcome the new year. Nyx is looking forward to just this as she rides the train to Canterlot with Spike and Twilight. She's going to meet her extended family for the first time and wants nothing more than to make a good impression. Yet, the sheen of the holidays can't hide the trouble caused by meddling grandparents, relentless reporters, and a paranoid uncle.

It's Nightmare Night, and Luna is visiting Ponyville again. The mayor tasks Twilight with guiding and helping Luna around Ponyville and making sure the Princess has a good stay. Though Luna comes to Ponyville with a proposition for Twilight.