The phrase "I'm your wing" and variations thereof has been used by pegasi since pre-unification times; particularly those that serve in the military. It means: "I've got your back no matter what." Nowadays, few pegasi rally that cry around like the Wonderbolts do. And no Wonderbolt rallies that cry around quite like Misty Fly does.
Whether she's guiding her partner through a difficult maneuver or helping her comrades overcome personal anxieties, Misty Fly is a pony who puts her team first. Her dedication to being a team player above and beyond the call of duty has earned her nicknames such as "The Ideal Wingpony" and "The Wonderbolts' Unofficial Shrink." She considers these nicknames to be badges of honor, and she does her best to live up to them.
But when a stray thunderbolt puts her out of commission, her self-confidence is shaken. She feels as though she let her team (and by extension, Spitfire) down. And while the pony she admires most is going through a rough patch, she's confined to a bed and unable to do anything about it. For once, she feels weak. For once, she feels useless. For once, she needs somepony to be her wing.
Takes place during the events of My Little Investigations: Wonderbolts Under Fire, but has no major spoilers. Rated Teen for some language and suggestive imagery.