She shouldn't be in love
"Xiaohua, would you like to go out with me?" He asked her with a smile.
"No, no," she panicked. "I'm just a little demon. I don't have enough cultivation to leave my original body."
"She is mine, and she is also the only nemesis of the demonic things in the nine heavens. Go and bring her back."
"Your Majesty, why are you anxious? She has just experienced it in the mortal world and will not be in danger."
...