A moment later, he was back, still frowning, and carrying a slip of paper in one hand. "Hold still," he told Naruto brusquely.
The Genin eyed the ward warily. "Is this going to hurt?" he asked.
"No," and then there was a flash of smoke and light as the thing was slapped against his forehead.
"Why not just give him an access token?" Sakura asked over the coughing fit that followed.
"This is the portable form of the attunement seal," he told her, then handed a small wooded disc to the recovering blond. "Here; make sure you're always carrying this when you try and go in here."
...I had meant to get a lot farther on this before I posted, but my PC downloaded an update - without asking - and has started bitching about how it wants to reboot and fuck whatever I was doing... so here it is, before the piece of junk manages an end run around me.
Ja, -n
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"Puripuri puripuri... Bang!"