Author's Note: This dabble sprung from a discussion I had with a friend regarding the differences between Kirk Prime and nu!Kirk – and I thought the difference in eye colour, well, it made all the difference. This is the result of that idea.
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As Spock watched James Tiberius Kirk become captain of the starship USS Enterprise, he could not help but compare the young man to another man he had known in another lifetime.

Jim Kirk, the one born in the cornfields of Iowa, had grown up with his feet firmly planted on the ground while gazing to the stars, knowing with an unbreakable certainty that one day he would fly among them. The other Jim Kirk, the one born among those very same yet completely different stars, had to come down and crash into Earth, before he could regain his balance and even contemplate reaching out to the stars again.

Jim Kirk was dynamic, a force of nature like a broad river. He followed his course without hesitation, pulling everything with him and shaping himself after the circumstances where it was possible while never losing his way or his true nature. The other Jim Kirk was also dynamic, a force of nature like a roaring waterfall. He came thundering down, pulling everything with him with roaring energy and eventually crushed all obstacles.

Jim Kirk shone with the radiance of a sun, eyes a warm, golden brown or a soft green when the light hit in certain ways. The other Jim Kirk shone as brightly as a supernova, not any less radiant, but his impossibly blue eyes freezing and sharp as ice, and Spock could not help but remember the destruction of a planet that he had known for an entire lifetime.

Jim Kirk knew he would die alone. Spock knew that the other Jim Kirk hadn't spared a thought for his own mortality, but he knew just as well that this Jim Kirk would also die alone.