This is a fun read, short and sweet. Like a small slice of cake.
I really can't find fault with it deserving of the negative votes beyond people not like the fetish element. ::sigh:: Some people have nothing better to do.

Having Celestia gorging on cake and getting fat might be a bit cliché by now, but it's hard to complain about good content. I do like the way you decided to do the ending- as fun as "and then she was fat forever the end" is, this seems much more in-character and fitting. I'll lend you an upvote to fight the (imo undeserved) reds.

A short, simple read, but a very pleasant one! Celly and cake always seem to go well together; her figure sure seems to benefit from it~

Love it.

Though I suspect Luna may be a bit too aware of what the cake did to Celestia's figure to fall for such a simple trick.