This Nightmare Night, what sweeter satisfaction could there be than slipping into your sister's skin for a sunset soiree stuffed with suiting shenanigans?

Luna: "Behold, subjects! I am your new ruler, the mighty Daybreaker! Fear my blazing sun!"
Celestia: "Please sister, I'd be far more terrifying than that if I really wanted. Though I do admit, your Daybreaker costume is most impressive."
Luna: "Hmph, I daresay I wear your form better than you could. These whites and reds really do 'suit' me. Come now, at least pretend to cower before my make-believe villainy! Where's your sense of fun?"
Celestia: "Very well then, oh great and powerful Daybreaker, what mischief shall you rain down upon this hapless kingdom tonight?"
Luna: "That's more like it. I proclaim that all fillies and colts shall have twice the candy rations they are normally permitted! And horror movies shall play nonstop on every television set! Mwahahaha!"
Celestia: "Well, two can play at that game. And don't forget, dearest sister, you're in my domain now. Thou shalt never match my prowess over the eternal night!"

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Headswapped alt of this pic: https://derpibooru.org/images/3234827

Yes I know it's not Halloween yet lol

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