Black Zetsu chatted a little longer without betraying anything, drawing out the last point Yin remembered-
Yin simply thought he had passed out from exhausting himself during Taijutsu training. When he opened his eyes again, Black Zetsu was watching over him, so he was very happy when he woke up.
Since Yin had never lied about himself, and neither his expression nor his behavior showed anything unusual, Black Zetsu tentatively believed him and sent the boy off to study Sealing Jutsu.
But he still felt deeply uneasy. The [Order] within him had never gone out of control like this before.
I've acted this way for a thousand years, always keeping in line. I've never encountered a moment when the [Order] intervened to bring my will into line.
Of course, it might have already altered my will without my knowing.
After all, before Yin, I'd never been this close to any living creature. Whenever something went wrong, I simply punished them or killed them outright.
And I've always lacked power. I'm cautious by nature, too, and can't afford to trust others easily.
So even if parts of me were unknowingly altered in the past, I would have struggled to notice without a point of reference.
Only yesterday did I punish Yin beyond reasonable limits while fully conscious.
That was completely unlike my usual self. I should have been on my guard, but throughout last night's incident, nothing in my mind felt amiss. I simply thought Yin was being far too unruly.
But thinking back now, Yin only wanted my attention. His behavior was no different from usual.
I was the one who was wrong. My will was tampered with...
-No, not tampered with. It was brought into alignment with Mother Kaguya's.
*-How utterly treasonous. I actually wanted to put the [Order]