Read The Fox Concubine Manga:
Stone-faced prince x quick-witted fox? Nonono, just a kiss, little fox will become the beauty. Secret agent Sylph is transported into another world due to a typhoon and becomes a fox. Confronting demons’ sudden pursuit and eager to leave here, she seeks help from a cruel expressionless prince passing by and agrees to be taken back home. When they get home, it turns out to be that he is the real cruel more.. demon! Then the prince the little fox has a great power too as him. How would he treat her? As a pet? An enemy? Or a wife?