If you give a princess the sun, then she'll want to raise it. Of course if she raises it, she'll be tiered and wont be able to raise the moon. If she cant raise the moon, then she'll need a sister to raise it. If she gets a sister then her sister will get jealous and get trapped in the moon. If she gets trapped in the moon then a prodigy will eventually realize she's escaping. And if a prodigy realizes a princess' princess sister is going to escape from the moon than you'll need to start a TV show.
If you give Celestia the Sun, she will want a a glass of milk If you give her a glass of milk, she will want a piece of cake cake If you give her a piece of cake, she will want the moon If you give her the moon, she will want some bananas If you give her some bananas, she will send you to the moon