"Thanks, Mom." Two simple words said by a simple guard.

Not so simple when those words are accidentally addressed to Princess Celestia.

Our protagonist falls from the sky and accidentally possesses Celestia, they then proceeds to do the only rational thing any sane person would do in his situation, abuse their new found power like Tartarus.

The cover art is not mine and can be found here (send them chocolate cake): http://magister39.deviantart.com/art/Celestia-Commander-Easyglider-costume-456932539

Sweetie Bell's Parents are thrilled that their daughter is bringing her coltfriend home to meet them.

Well, until they find out it's Big Macintosh...

NOTE: Sweetie Bell is of the appropriate age.