For Sweetie Belle, having a babysitter is not that big a problem, especially when her babysitter is the element of magic herself. When Twilight devises a spell to help her with her apparent problems, however, both of them will have to learn a lesson that won't soon be forgotten.
Now has a sequel called Sizable Differences
Enjoy.
Learning magic from princess Twilight herself is great, though Sweetie is having a hard time. When Twilight devises a spell to help her out, things only get worse.
Being turned into a fully grown alicorn was bad enough. But having to contend with a sudden interest from her mentor that reawakens long forgotten feelings? Twilight's life just got a whole lot more complicated.