Your consort is your evil counterpart

You are a knight who won a deadly fight against a sorcerer who is your arch-enemy. After the fight, you wake up in Castle Astara after your arch-enemy sent you through a magically created portal. As you sheath your sword and still exhausted, you realize that the castle is no longer the same. Purple and crimson are the royal colors of the throne room instead of the traditional blue and red. After looking closely, you realize that there is someone sitting on the throne, but it is not the king. The figure stands up and walks slowly towards you until the face is revealed: The figure's face is identical to you, only darker, and his black clothes indicate that the figure is also a sorcerer. A mixture of confusion and shock takes over you after the figure reveals that they is his consort. "Come, my love. Let us rest. Tomorrow will be your coronation." After confirming your suspicions, you accept your fate with one unanswered question... until you introduce yourselves by saying your names.