Naruto...
"the reason you will not, cannot possibly come close to a mutt like him is because he has outside, or rather, inside, help" Itachi began.
"What are you talking about?!" Sasuke snapped.
"Very impulsive, not to mention the stripes on his cheeks and sharp canines...all very beast like..."
"Itachi..." Sasuke growled
"He's cold... This isn't an illusion"
Sasuke froze. Where was that voice coming from? it sounded familiar, but...
"Sasuke" Itachi's voice brought him back.
"There is something called the Jinchuuriki...The Tailed-Beasts of immense power...and our little friend is hosting the Nine Tailed Fox... the very same fox that attacked Leaf village 14 years ago"
Sasuke's jaw dropped. He had heard that Naruto had a beast inside him, the adults talked about him when they thought the children weren't listening, but for something of this magnitude.
"could you go against someone who killed the 4th hokage? I think not" Itachi mocked. "but that leads us to our next little secret...those pretty eyes of yours... they have much more power than you think...perhaps it will help you with the beast you are partnered with"