There is one connection, revered by all Vulcans, a mental link that surpasses all others. It is more, and everything, greater and constant through time and space, so rare that very few Vulcans believe it to even exist. The closest equivalent in Terran Standard is that of a soulmate. Friend, brother, lover: the name encompasses all of definitions and is indistinguishable from one another.
T'hy'la.
There is only one person that Spock shares such a connection with, even though it took him too long to discover it for himself.
It was born from a single instance, two warriors convening upon a battlefield; a moment of violence and feeling, conjured between them like ancient times, his hand around James Kirk's throat on the bridge of the Enterprise, and Spock was blind to it until he no longer possessed it. Spock's mind was a broken landscape of red cracks and too wide fissures from the sudden severance of the k’war’ma’khon, nestling something bright and precious that he never knew was there until it wasn't.
Logic vanishes with goodbyes. The bond snapped the moment of Kirk's death. He lost control, rage filling the space that once held a part of his katra, and all Spock could consider was revenge upon the black blight left upon his mind, ❛ Kill him, Spock told himself. Kill him now, here. So he will never have the opportunity to harm anyone ever again. Kill him because of all he has murdered. Kill him because of…Jim. ❜
Whether or not Spock shares this information and how it is handled, is entirely dependent on the development of his relationship with Jim Kirk, and is reflected in severely detailed, long-term plots.
Please note* this HC applies to @invictasol and @traiilblazer respectively, and is exclusive to them only. This tidbit will not apply to any other version of this muse or any other muse really given context in the footnotes of the TMP novel.