"This is my deal with you!"
To the Nine-Tails, this was nothing more than a mutually beneficial deal. In exchange for treating Uzumaki Kuming, it would gain freedom from being sealed away. It would only be limited freedom, but the Nine-Tails still yearned for it.
However, Uzumaki Kuming clearly wasn't focused on the "deal." When he heard the Nine-Tails admit that it didn't know what it would do after breaking the seal, an idea had already taken shape in his mind. Since the Nine-Tails didn't know what it wanted to do, Kuming would help it figure out what to do once it was free.
For an immortal being, deciding what to do tomorrow was obviously a difficult question to answer.
"A deal? You're right! For the two of us, this is nothing more than a deal."
"But, Kurama, if you don't even know what you want to do, what good would breaking the seal do?"
"You'd still be a fox in a cage. That wouldn't change."
"I've heard a tale about you."
"I heard that the nine Tailed Beasts living in the Shinobi World today were created by the Sage of Six Paths. In other words, the Sage of Six Paths was your father."
"Do you remember why the Sage of Six Paths created you?"
"What did the Sage of Six Paths expect of you Tailed Beasts?"
What Uzumaki Kuming had said was a genuine secret. When the Nine-Tails heard him, it widened its eyes and stared at him in disbelief. It had no idea how this young man knew that the Tailed Beasts had been created by the Sage of Six Paths. The widely accepted belief in the Shinobi World was that the Tailed Beasts were creatures formed naturally from Chakra, a miracle of nature.
Only the Tailed Beasts