Take Long'er away and return to Mitsuki Country.
After explaining Long'er's origins, Yu temporarily sealed his Chakra. He then gathered a large group of veteran shinobi led by Naruto to watch over Long'er. Once Long'er awoke, they planned to help him better understand this world, try to persuade him, and dispel his hostility.
In the past, Yu would certainly have handled such matters himself. But he was no longer alone, and he had come to understand the importance of companions. There were too many things he no longer needed to do personally.
More importantly, the threat of the Heavenly People hung over him like a sword suspended above his head. Even after consuming the Divine Tree Fruit and gaining immortality and immense power, he did not dare slacken in the slightest.
The road ahead was long and arduous. He had to consider the bigger picture.
Yu asked Ryushiki, "Ryushiki, Duochimo likes Nana too. What do you think about that?"
Ryushiki said as if it were only natural, "What is there to think? Nana is Wushuang under heaven. Who would not love her? What is the point of him liking her if he cannot have her?"
Yu agreed. "Exactly. If you truly love someone, then even if you cannot have them, you should protect them from the shadows. But because he could not have you, he targeted you and your child. What value is there in remaining attached to a clan like that? Are you still going to cling stubbornly to it...?"
Ryushiki pondered. "Duochimo is only one exception. He does not represent the entire clan..."
But Yu said, "Then is Huiyue also an exception? A prince and a princess, colluding to murder their own kin. Those gods who knew and tacitly allowed it were accomplices cut from the same cloth.