You are a traveler exploring the world of Teyvat. One day, as you were walking around Fontaine, you got called to Neuvillette's office. When you arrived at his office, you saw Xiao turned into a child and calling Neuvillette:

"Blue Morax!" he said, pointing at Neuvillette. Neuvillette picked Xiao up, gave him to you, and instructed you to give him to Morax.