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"Hey, Naruto," Sasuke said.

"Yeah?" Naruto asked, turning to look at Sasuke.

Instantly, the world seemed to grey out around him, and Sasuke rippled and expanded, growing eyes and mouths all over his body, his stomach collapsing and being sucked up into his chest, and even his chest shrinking as his insides crawled out through his face and began waving fanged cillia and ichor covered tentacles. "Tellikiliki –li!" he piped through a series of holes in his flesh.

"GAH!" Naruto said, and fell over backwards. He lay there for a moment, formed a seal, and said, "Kai."

The genjutsu broken, Naruto sat back up and gave Sasuke a longsuffering look. "Was there anything else?" he asked in a dry tone.

"Nah, that was it, thanks." Sasuke turned away.

"I'll quit falling for that one day," Naruto muttered.

While Hinata worked on her speed and agility and Naruto worked on his jutsu, Sasuke worked on sharingan genjutsu. Unfortunately, that meant that Naruto got more than his fair share of horrible visions, misdirections, and had even gotten lost once in the kitchen for nearly five minutes before he realized that his thinking was muddled.

They all already knew genjutsu, of course. Sasuke had learned half a dozen from the scrolls Hinata had read from afar. Naruto knew two himself, learned from Ibiki during his time spent as the mascot of T&I. Naruto had, of course, attempted to teach them to Hinata, but with mixed results.

The first, a basic genjutsu called Hell Viewing Technique, she was completely unable to use. It produced a vision of the user's choice as well as a suggestion in the victim's mind that the vision was truly horrific, so theoretically someone not afraid of, say, dogs, could be utterly freaked out by a vision of dogs provided by the Hell Viewing Technique. Hinata's attempts to use it on Naruto had produced a vague sense of unease and a weirdly distorted vision that was like a garish explosion of colors and movement. Distracting, yes, but not so much that it impaired him. Sadly, Naruto had no idea of how to help her improve since he was lackluster at the technique himself. Though the fear he produced was substantial, his vision was somehow lacking, making the victim realize it was a genjutsu immediately. Sasuke was, of course, quite adept once he learned it, but it was a weak technique at best.

The second was an unnamed torture technique. It was quite powerful in its way, but had sharp limits. It was a contact genjutsu, and relied on the user literally overpowering the chakra network of the victim to cause physical sensations of the user's choice. Ibiki used it on prisoners who's chakra network had been weakened by drugs and seals, or even shut off entirely by one of the Hyuga ANBU. Naruto just used it as normal, and had never had anyone able to resist. Hinata lacked the power to overwhelm Naruto when she practiced it on him, but she could shut off his chakra network herself, at least for short periods. Their first kiss, daringly initiated by Hinata, had been a sensory illusion she caused in him. Sasuke, without Naruto's immensely powerful chakra or Hinata's ability to shut off the chakra coils in the victim, hadn't been able to do it without Hinata's help, and had put nothing beyond the most cursory effort into learning it.

The answer of why Hinata had been able to use one and not the other had come from a brief conversation Sasuke had with Sakura. Sakura was in traning to be a genjutsu specialist, so naturally had knowledge the others had lacked. A little coaxing by Sasuke, at Naruto's insistence of course, had gotten all kinds of secrets from her.

Apparently, for vision genjutsu to work, you had to understand how your victim saw the world. A ninja with poor vision actually had an excellent chance of realizing that they were under a genjutsu because the vision they were confronted with was usually too sharp to be natural. The more intelligent animals, such as summons and ninja dogs, resisted most sensory illusions because their senses were wildly different from human's. Hyuga might briefly see an illusion, but they also saw the chakra behind it and the real world at more or less the same time, so had no trouble manipulating their chakra to neutralize any effect.

Also, genjutsu were supposed to be subtle, easily overlooked things. Naruto overpowered his genjutsu like he did everything else. It worked for one designed to overpower, but not so much on the subtle ones. Hinata just didn't understand how normal people saw the world, so her efforts to mislead produced only odd visual effects. Naruto at first assumed that it was how she saw the world, but Sakura had shot that theory down. Hinata's genjutsu targeted coils in the eyes that normal people didn't have, so what he saw from her was really just a mishmash of signals.

So how, then, was Sasuke able to cast realistic genjutsu? Naruto was damned sure that Sasuke saw the world different from anyone else. Hell, he bragged about it.

The answer, it turned out, lay in the sharingan's ability to copy and mimic techniques, for the normal genjutsu, and in the sharigan's ability to bypass creative visions and go straight to hypnotic suggestion.

When Kakashi started teaching him the basics of how to ensnare the mind with nothing but a glance, Sasuke proved an apt student.

Of course.

Ask Me No Questions, Chapter 10