Twas said long ago, that the kiss of a heart full of mirth t'would awaken our long slumbering king from his rest. It t'would appear such myth twas fact!
-Grandpa Gruff

And as Pinkie is about to discover, King Grover is a charmer. But how will her friends react?

Teen due to threats of harm, attempts of old timey wooing, and other such actions.

Also, I'm preeeeetty sure there might be some music references throughout, because Rock is awesome.