The darkness

After the sun celebration and every pony whent home,luna found her sister in the library. "Celestia, we need to talk" luna said though gritted teeth. Celestia looked up and frowned. "Luna,I have no time for games." Celestia said puting her book down. "Says the mare who is a cocky bragger and I lier!" Luna snapped. 'Luna,what are you saying!? Celestia said getting angry.