Fluttershy considers Rainbow Dash to be her very best friend, knowing her much longer than the rest of the Mane 6, and the two consider themselves close as sisters. However, odd feelings begin to stir around in Fluttershy when she finds out her best friend has started dating Soarin from the Wonderbolts. She struggles to keep the feelings down as she's forced to watch the pony she loves love somepony else.
Credit to EnergyFrost, anarchemitis, and MusicFireWind on deviantART for the vectors used for the cover art