If he had spoken while she was with them on his intention to invade and bring down the other sects, that would have given away his identity as Demon Lord Zhurong and not the Prince Rong that he presented himself as, this would have destroyed his chance of finding out the thing that strongly drew him to Xu Hui. Hei Zhurong wanted to be the one to let her go and not the other way around, should he grow tired of her.
"Yes, Prince Rong. We will be awaiting your orders at the throne room!"
Yin Ta postrated once more, before heading out of the room to tell the others of the demon lord's orders.
"Xu Hui, I have to leave, but when I return I will bring you to my favorite spot in all the realm."
Demon Lord Zhurong held the "Eye of Yao" closely under the sleeves of his robes, this was to suppress his demon spirit energy for the thing he was about to do to the female cultivator whose eyes were shut close in a slumber.
