Initiative
This man was none other than Hun Changqing. After he had used Mirror Flower, Water Moon on Xiao Yi Xian in that desert, the soul-affecting three-light divine water, mixed with the power of his heaven-realm soul, had silently pierced her weak soul defenses and invaded her Soul Sea.
Although he could not completely rewrite her will, he could make himself fully replace Xiao Yan's image in her heart. Once the power of Mirror Flower, Water Moon had continued influencing her mind for a while, he would even be able to make Xiao Yan appear before her with a mere thought.
With Mirror Flower, Water Moon controlling Xiao Yi Xian's five senses, this illusory Xiao Yan would be no different from the real one in her eyes. She could see him and touch him. Even if she wanted to share the clouds and rain with him, the technique could give her intensely powerful pleasure. All Hun Changqing needed to do afterward was leave a few marks on her body, and the deception would be seamless.
Hun Changqing intended to create a Xiao Yan who would remain in the Netherworld Hall forever, giving Xiao Yi Xian comfort in both body and heart and keeping her satisfied. That way, she would become an utterly obedient enforcer, ready to do his bidding.
Moreover, this "Xiao Yan" would be entirely under Hun Changqing's control. Even if Xiao Yi Xian eventually managed to escape Mirror Flower, Water Moon for some reason, he would know immediately and could kill her. Why would he not do it?
*Xiao Yi Xian's situation is more or less settled. Next... comes Gu Xun'er. With her current temperament, she certainly won't pass up the Bodhi Heart. She'll definitely go to the Vast Desolate Ancient Region in a month. I'll settle things