In The Meeting (Part 2) of OBJECTION!!!! Spike’s Sacrifice Was Completely Unnecessary. Rarity, Rainbow, and Fluttershy tell everyone what happened 7 years ago, when they confess to the cakes about what happened to MMMM.

I just wanted to write a side story to that little plot.

Now that The National Dessert Competition was over. Rarity, Rainbow, and Fluttershy realized that they have to tell Mr. and Mrs. Cake about what they did to MMMM.

As long as they apologize, they're sure the Cakes will forgive them... Right?!