The Reason Luna isn't allowed Coffee

A tale of what happened to Luna when she decided to indulge in the beverage known as coffee

Long has the coffee branch of StarBuck been open in Canterlot and long has Celestia frequented it. She always grabs her order and returns to the castle to enjoy it, Luna however has been curious of the beverage known as coffee. So one day she sips her first drink....nopony was prepared for what transpired.