Princess Celestia and Princess Luna REALLY don't want you leaving the castle in this weather, but they're also gonna cuddle the heck out of you if you stay. A play off the classic holiday song.
It is Celestia’s birthday, but instead of getting a whole cake like last year, Luna only brings her a single slice, saying that she won’t allow her anywhere near the rest. What other course is there but to declare war?
Celestia is the very image of beauty and perfection, and has been for over a thousand years. Inevitably, she receives a large number of letters every Hearts and Hooves Day. Luna is not amused, especially when they interfere with politics.
The appearance of Equestrian Princesses on Earth, as well as the subsequent negotiations, are complicated greatly by the fact that neither can speak the others' language.