Image imported from derpibooru
Original Description:

Luna: “So glad you could join me in this year’s Nightmare Night festivities, sister!”
Celestia: “Of course, Luna. I couldn’t think of spending it with anypony other than you. Though, I must say, these costumes certainly are… an interesting way to play the part.”
Luna: “Oh, come on, Celestia! It’s all in good fun. Besides, you look positively diabolical as Daybreaker. The flames certainly ‘suit’ you~”
Celestia: “Well, if you put it like that. I must admit, these do make for quite the convincing disguise. Why, I would almost mistake you for the real thing!”
Luna: “But I am, sister! Behold, I am the fearsome Nightmare Moon! Tremble before my dark and mysterious aura!”
Celestia: “Oh, Luna, you do make quite the imposing figure. But look at me! I am Daybreaker, the embodiment of scorching sunlight!”
Luna: “Your fiery ensemble truly captures your essence, dear sister. But remember, I am the mistress of the night. Prepare for a night filled with spine-tingling fright!”
Celestia: “And I shall illuminate the night with my radiant presence, Luna. Let’s make this Nightmare Night a truly unforgettable experience!”

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Commission I received from the wonderful Jen-Foxworth, please go check out their original image here!

I commissioned this image as a Halloween treat for my ponysuiting server! If you’d like to see more fics and pics like this, come join and say hi! https://discord.gg/58j6vVgbB4 (18+ only)