Which one is the queen?

I was summoned to a different world together with my cousin. However, I was told that only one person was needed. Well then, let's make my cousin the crown prince's fiancée. She's cute anyway. I, who remained behind, obtained a strange power while escaping from the royal palace. Because of that, I was sent flying to a continent ruled by the Demon King... Huh? Me, the Demon King's wife? That's impossible. Revision completed.