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