Dear, I have a transmigration novel similar to the nine-year-old little demon queen to recommend to you. It's called "The Demoness Descends the Mountain." Just like the nine-year-old little demon queen, the protagonist was also a little demon with a black belly and a little provocation. She began her adventure in the world after transmigration. This novel was also an ancient romance novel. The relationship between the main character and the male protagonist also developed bit by bit. It was very sweet. I hope you will like this novel. Muah ~