Warning: slightly random concept.
Sweetie Belle is eager to start casting actual spells.
A little too eager.
After things go awry and Sweetie Belle's body goes through some... changes, Twilight steps up to aid in her recovery and teach her to see the bright side of the situation.
After all, turning yourself into a balloon isn't easy. That takes talent... and effort. Whether you'd want to is another matter entirely.
Additional tags: balloon, Twilight mentoring, post-spell rehabilitation, Scootaloo not being the elephant in the room, Sweetie Belle's parents showing up when they are needed, and a notable lack of Rarity. Really, you can note the lack. Also implied cruelty to bullies, which the author does not recommend, condone, or preach in any way, shape or form, and he wouldn't be warning people about it if he could have nice things.
Written for the Balloon Ponies January Contest.