Dear Morgana,
It is hard to imagine, after all the time we have been together, that you would betray me. You have been nothing more than a sister to me, and I couldn't have asked for anything more. You have always been by my side, and I have always been by yours, as why we were always known as the perfect duo. Though I understand your fear of the magic you possess, I still find the need of turning your back on your own family unnecessary. You knew that I am always here for you, yet you still decided to avoid my desperate plea of breaking through this barrier between us, that I am still in question of the explanation of its existence. You have always been so sweet and loving, and with magic or not, I will always see you as one of good intentions. Please come back home. Please come back to where you've always belonged. I not only beg of you as a worried brother, but as a childhood friend who has always looked after you.
From your brother, Arthur