It’s Just That Any One of Us Is Half Without Another One Is You – Chapter One
In which Kakashi sees Sasuke in a new way and gives him a rather different lecture after his fight with Naruto on the hospital roof.
A flash of familiar exasperation tightened Kakashi’s mouth behind his mask, but he didn’t think an admonition to grow up already would go over very well right now. Not right after Sasuke had faced his brother and been reminded of that bloody night all over again.