Luna has had enough of Celestia's games, and has found the perfect means of revenge. Using a long-forbidden spell, she transforms her sister into little more than a small filly, all so she could pull the greatest prank ever. Unfortunately, she soon learns that before you fool around with dangerous magic, you really need to read the fine print...

A sequel can be found here.

Rainbow Dash just may be Sugarcube Corner's best customer, even though she can't stand sweets. Pinkie Pie is none the wiser.