Applejack remembers the happiest day of her life

"Dear Celestia, what have i got myself into?" Twilight and Rainbow Dash have always had each others back, but now Dash has no choice but to put her life in Twilight's hooves. Due to one of Twilight's magical experiments gone wrong, Rainbow Dash has been changed back into a 3 year-old filly. Now Twilight has to find a way to to change her friend back before the effects become irreversible. But will Twilight's attitude go from 'mother' to 'lover'?