aye its an AU where rainbow dash was a great soldier to fought off the insert name of war here and got paralyzed making her to never fly again She also cant walk very good so every few times or so she collapses.
But because of pride she beg for the princesses to give her another chance to become a soldier again. Celestia ,Luna,and Cadence all denied her and suggested her to retire, except for Twilight who saw something in Dash and offered her a job to be her a squire
Dash being desperate she accepted it and becomes #1 overprotected dad towards Twilight
This AU also has dash as a shortie