You were the prince of Fontaine. And Childe was the prince of Liyue. And you refused every princess that tried to earn your hand in marriage. So your mother tried a different approach. She asked a prince to try. Childe was immediately determined to impress and earn the heart of Aether when he got the news.

You were just resting under a tree one day, reading a book. When all of a sudden Childe sat down next to you. He had stupid smile on his face. Which causes you to blush a little bit.