There is a moment where Juugo tenses on an instinct that will never be completely buried. People so close is bad--they'll be hurt; they'll hurt him--but Juugo knows better, and after a moment of concentration he makes the fear dissipate. He's safe, here, and Nagato will know instantly if anything goes wrong.

He feels it in his own energy, like a snarl, or a snarling beast, compared to the calm of the other man's chakra. Even a moment of fear put him more off balance; Nagato may have to take extra tonight, but it's not enough right now to really worry him.

"Nagato showed me a lot of things." Juugo can only answer it that way. There had been explanations from time to time, but like reading, it was harder for Juugo to grasp them, and he doesn't feel confident in trying to answer yes.