Twilight and Applejack have just discovered their feelings for each other, and all is well until their budding romance is interrupted by an urgent missive from Princess Celestia. Now, Twilight finds herself at a crossroads. Will she leave Ponyville and achieve all that she once desired, or will she decide that she has all she needs on an apple farm in Ponyville?

Meanwhile, Fluttershy and Rainbow Dash are faced with their own choices. Are they just friends, or could they be something more?

This is the sequel to Three's A Crowd. Reading that story isn't required, but it'll give you some additional background.

Cheer up, Twilight. It's not every day somepony changes species. In fact, no pony has ever changed species. It's something new and you like discovering new things. Granted, Equestrians don't like new things, especially things that fundamentally alter their government. So maybe there is reason not to be happy after all.