Do You Want Nightmare Moons?

Due to an oversight, Luna is left out of a book for foals. Two royal guards take action to ensure that the princess doesn't react too harshly to this terrible slight.

Royal Guard Silver Birch knows Princess Luna's history, and her... extreme reactions to being neglected in the past. When it seems Luna has been snubbed yet again, he and his partner Winter Garden take action to shield their Princess from this slight, and spare Equestria her terrible wrath.