Ah, siblings. They can make our lives wonderful – or downright miserable. If you think these two have ever been any different, you might want to reconsider.

In fact, Celestia Prince, age 5, really wasn't thrilled when introduced to her baby sister, Luna. Why would anyone want to be around a yelling, frog-like thing, anyway? It surely meant nothing but trouble.

Not too long after, the little "Monster" stole her heart forever. And frankly, she wouldn't have it any other way, no matter what.

Chapter 1 partly based on my own experience; explained in the Author's Notes.

Also, with the "Wondercolts Forever" a.k.a. Celestia & Luna's shared diary published a little while ago, this story is now set in an AU, it seems.