Princesses Celestia and Luna

It was a very happy day in Equestria. As a matter of fact, it seemed like any other day, cheerful and full of love. But somehow it seemed as if their was a dark cloud looming over Canterlot's castle. And as Twilight Sparkle approached the castle, she could feel the looming cloud affecting her mood as well. Twilight walked into the castle and up to Princess Celestia. "Princess Celestia why is everything so...well, depressing today?" Princess Celestia looked at Twilight with sadness in her eyes. "I am truly sorry Twilight. I do not think I could bare to talk a about it." Twilight looked down at her hooves. "Yes, I understand." And she trotted off to find Princess Luna. Surely she could tell her what was going on. "Twilight if you really wish to know that badly I shall tell you why everypony is so sad today." Luna told her. "It is because this is a very terrible day in our past. The day our other sister passed away." Twilight gasped. "You had another sister?" She asked. "Yes indeed Twilight. Yes indeed." Luna responded as a tear slide down her muzzle. "She was our older sister. Her name was Midnight Pyro."