Itachi comes back the next day. As soon as he walks in he says:
"We found one, Kisame come on."
Kisame stands up, looking at Naruto, and replies:
"And who stays…"
"DEIDARAAA!"
The blond guy runs out of the room, still putting his robe on:
"I'M COMING! What's up?"
Itachi neither looks at him. Kisame laughs. Itachi answers, nodding in Naruto's direction:
"Look over him. C'mon, you."
He grabs Naruto's shirt again and pulls him through another hole in the wall, throwing him down in an empty 'room'.
He nods to Deidara, 'follow', and so the blondie does.
The room is completely empty, and he leans against the wall.
Itachi grabs Naruto's shirt again and pushes him down, to sit on the ground.
Then he tells him to stay there, be still and be quiet.
"Say a word and I'll cut your throat."
Deidara asks Itachi:
"Oh. Right. You're going?"
"Yeah. Look at him, strictly. He mustn't move from here. The less he talks, the better it is."
"But we'll talk"
"You understand."
Kisame is left out of the room, there are only those three.
Itachi looks Deidara in eyes for a second, Deidara stays still and his face looks like 'I must understand something'.
Then he nods; he puts a finger on Itachi's forehead and stays there for a minute.
Then Naruto sees Itachi and Deidara exchange appearances.
Itachi becomes Deidara, and Deidara becomes Itachi.
Deidara/Itachi says:
"Play it well. Tell Kisame too after, but then shut up. I'm going against orders."
Itachi/Deidara laughs, pats Naruto's head and says, going out:
"All right. I don't give a fuck, and I'll get fun going out of here."
He leaves with Kisame, and Naruto still doesn't dare saying a word.
He watches Deidara/Itachi – or well, Itachi – waiting for the others to go, and then regaining his normal appearance.
Itachi sits down near him, constantly glancing the hole, never looking at him. Naruto asks:
"No chairs in here, huh?"
"No time to find them, huh?"
"… All right. You …"
"Shut your motherfucking hole up".
Naruto gets a bit angry.
Okay everything, but you can't just tell people 'Shut your motherfucking hole up' and expect that they don't say a word.
"I get –"
"SHUT. YOUR. MOTHER. FUCKING. HOLE. DOWN."
From up to down – he is getting really upset.
Naruto nods, thinking 'I'm not surprised he killed them all. If the whole family was this asshole... I wonder if Sasuke will become like this when he grows up. And by the way, the blond guy slept with the white-haired one? What's going on-'
Just to be sure, he moves a little bit away from Itachi. You can never tell.
Itachi looks at him, looks away, sighs and does – facepalm. He mumbles:
"Teenagers…"

A voice two rooms afar soars singing.
It is the white-haired guy, surely. He goes on singing while Itachi talks:
'New blood joins this earth - and quickly is subdued, through constant pained disgrace - the young boy learns their rules'
"I talk. I told you. You shut up and listen. All I'm going to say is true. All I'm going to say – you must go out there and tell Sasuke. All right?"
"If I go out in time – WAIT – I go out?"
'With time the child draws in, this whipping boy done wrong; deprived of all his thoughts, the young man struggles on'
"Hush. I fucking told you twice. Orochimaru wants to use Sasuke to reincarnate, as far as I can tell. This means he'll actually die. You go out there and defend him – I'll think about me."
"I defend him? But he is really stronger-!"
"I TOLD YOU – FUCKING – SHUT UP!"
- roars the other. Naruto nods.
'He's known – a vow unto his own, that never from this day his will they'll take away… what I've felt, what I've known'
"Our clan wanted to make a putsch. I had to stop them. I was an Anbu – don't ask, I was – and I knew it all.
'Never shined through in what I've shown. Never be, never see, won't see what might have been'
The Anbus knew something, but they didn't order me to do it. I did because my family wanted to use Sasuke – DON'T."
'Never free, never me; so I dub thee, Unforgiven'
Naruto puts a hand on his own mouth and nods again.
'He tries to please them all, this bitter man he is –throughout his life the same'
"He had to be killed by an Anbu. This was the trigger they planned, to begin their putsch. Ok?"
'He's battled constantly'
Naruto nods.
'This fight he cannot win. A tired man they see no longer cares – the old man then prepares to die regretfully'
"I always wanted to protect him. Now I won't let him become a Nukenin on my fault. You have to tell him these things."
'That old man here is me…'
Naruto nods.
'So I dub thee, Unforgiven…'
"I will be killed as soon as they find I'll let you go – you alri"
"Come to Konoha! …"
'You labeled me, I'll label you…'
Itachi looks at him, baffled.
'So I dub thee, Unforgiven…'