When Pinkie falls ill, Rarity takes her place as a foalsitter for The Cake Twins, and they take a real shine her to. This makes Pinkie feel like she's been replaced, and it's up Mr. and Mrs. Cake to show her that's not true.
I'm a brony and a Pinkie Pie fan but I like all of the mane six, as well as Spike. I hope to provide some entertaining and interesting fanfics for the Brony community.