Navigating politics is hard enough when you're not a horse.

Twilight and Luna go on a date.

When you're a ruler of a major country, you don't have much time for yourself.

An unforseen problem with a Princess' mode of immortality

Luna is the princess of the night. So it makes sense Celestia wants her to explore the nightlife.

Celestia, feeling troubled, decides to pop in on Twilight.