The Yondaime Hokage nodded, and winced as the motion made his head hurt. He forced himself into a semi-upright position and managed to sip some water from the cup the Sandaime passed to him.
"Naruto is too young to have the entirety of the Kyūbi sealed into him; he simply lacks the capacity," he explained, passing back the cup before it slipped from his weak grasp. "So I split the Kyūbi's chakra, sealed the yin half into myself, and sealed the yang half into Naruto."
"Using the Eight Trigrams Sealing Style on both yourself and Naruto," Hiruzen observed. "It confirms my speculation, at least, though it raises more questions in turn. For instance, the seal allows some of the sealed chakra to seep out and mix with the host's own. Is your body capable of coping with it, and is there a chance the Kyūbi could escape?"
Minato sighed exhaustedly. "Must we discuss this now?"
In answer, the older man passed him a small mirror from the bedside table.
"We must," he replied, as Minato stared into the mirror. There was his sharp, pale face, framed by yellow bangs of hair. Instead of the familiar bright blue eyes, though, eyes with vivid purple irises and slit pupils stared back. No, not purple, but blue tainted with red.