What Should I Do If the Cub Demon Lord Is Picked up by a Spirit?

The male protagonist rejuvenates + the female protagonist's personality switching There is a most evil and evil nature hidden in Yu Yao's body. The God of War told her that she must wear the Jiuxuan Bracelet tempered with the blood of the Demon King to suppress the evil side. So she hid her immortal body and went to the demon world, where she accidentally picked up the demon king who had turned into a two-year-old child. In order to get the demon blood, Yu Yao worked hard to please the demon king, but her evil nature often came out to cause trouble. One moment she was extremely protective of the Demon Lord, and the next moment she was able to throw the Demon Lord into the river without mercy. After experiencing all kinds of defeats in life, the Demon King finally recovered his true form. The first thing he did was to find Yu Yao to settle the score, but he discovered that Yu Yao's other nature was actually the spirit of the person he had missed for thousands of years. Seeing the person who was once beyond his reach lose his memory and still be trapped in the body of a useless fairy, he suddenly had an interesting idea...