Ever since childhood Sasuke had lived in a red hazed world. Itachi's Tsukyomi had partially activated his own dormant Sharingan.
The Sharingan was greedy.
It grabbed and exaggerated reds even when it was sleeping. Whether it be the delicate, flushed tip of the bleached Ibis's wing, the bold wash in a shark attack or the small subtle amount in the other colors of the world. It was this extortion that caused the fine, mist-like haze.
The Sharingan was greedy.
Only one other lived in the red haze world. Itachi didn't count, his Sharingan were always awake, he lived in the red world. No, the other was Kakashi, his vision tainted by the gift of a dying comrade. Though his Sharingan was covered, its greed spread to his normal eye, giving it the effect of a sleeping Sharingan.
For the Sharingan was greedy.
They were forced to cope, forced to learn to live through the haze. It was strange though, living in a red haze world, when the red started to fade. When the sickness grabs hold and refuses to let go.
The Sound sickness they called it, the disease that ravaged him, leeched the world from his eyes. Sasuke whimpered and whined as the disease took him. He moaned and groaned in his restless slumber until he woke and the day was black. Panicked and angry the Sharingan woke and the world came back. Kakashi sat before him in the red world, his body black, the shadows white and the world behind him blood red.
"Sasuke, you're blind, they couldn't stop the sickness in time." He sadly said, hesitant hand reaching forth.
The Sharingan raged, water blinded.
Kakashi, hesitant no longer, lunged at the first hysteric sound. He held the Uchiha as he broke. He held him until the rage and panic exhausted and the boy slept. Kakashi released his hold and laid Sasuke down. Sasuke had a grip on him he was unable to break and thus laid with him.
Kakashi came everyday he could until Sasuke recovered. Then he walked out with Sasuke's slim, frail hand in his; red haze leading black world.