The princesses gave their magic to Twilight to prevent Tirek from stealing it. As a result, they end up stuck in Tartarus. The fact that things manage to go downhill here says a lot about the wonders of family.
Luna's has enough to deal with as Princess Twilight's student. Between nightly nightmares of moon princesses and the threat of an old enemy returning from Equestria's past, Luna isn't going to be getting any sleep any time soon
(Set in the story Celestia's Tiny Student by CommanderX5) The tiny student of Princess Celestia decides to take part in April Foals Day and use her skills and size to prank all her friends and family
Young Princess Cadance has gained the ability to see ponies' emotions, but sometimes what she sees puzzles and confuses her. Surely Princess Celestia can't actually be depressed?
The day of Shining Armor and Cadance's wedding anniversary is coming. Shining Armor, wants to give his wife a truly exceptional present, so he asks the Royal Guard of Canterlot for help. Things get very out of hoof from there.