Tied together for all of eternity means that there will be times when their souls will return to differnt bodies and seek out each other once more.

Welcome to a 1000 years after Star Trek:2009

On St. Patrick's Day, Spock has a Big Sekrit Evol Plan to get some nookie from his captain, but there are complications. (humor)

Spock is injured in a suicide bomber attack on Zeta III. Kirk finds him using
their bond but one of Spock's hands is severely injured. How can the Vulcan
continue to work as First Officer and Science Officer without the use of both
hands? Bones shall assist in the Vulcan's recovery as well as Kirk's TLC. K/S,
established relationship.

Captain Kirk's peculiar behavior has the rest of the crew disturbed, so Spock makes plans for shore leave.

This is the story of Jesus.  That is, if Jesus lived in the 23rd century, captained a starship, and was bonded to a Vulcan.  Also, Jim has broken the Prime Directive and must face the consequences.

Jim is subjected to a sadistic test. Spock is very confused. Bones keeps getting interrupted. This is what true love is all about.

Answer to the Prompt: Kirk and part/most/all of the crew thinks he's with Spock.  Spock says or does something with the belief that he is not emotionally attached to anyone.... Jim is devastated.

So obviously when I moved this story over here, the strikethrough text changed to normal, and I only just realised (and changed it) 3 months down the track.  It should be easier to read now.

Kirk's totally not even remotely in love with Spock. At all. At least, that's what he'd say on his press release, which no one would believe, since half the galaxy knows that he most definitely is. To make matters worse, he's also Spock's number one source of dating advice.  And then Uhura arranges a party for the crew...

For K/S Advent 2011. Based on this prompt: Kirk unrequited, watches as Spock dates various people, asking Kirk's advice along the way having no idea how he feels, and Jim being a Good Friend, helps him out.  Spock eventually figures it out (maybe snarky!Bones outright tells him, or maybe desperate!Jim catches oblivious!Spock under the mistletoe at the ship's end of year party, or maybe some other way - author to decide).

Originally called 'Existing'

This story is in response to KrazieKat2009's challenge called Another Universe.

Summary:

In an interesting turn of events, Jim Kirk (Abrams' Verse) gets transported to another Reality (transporter malfuction, alien technology, up to author's discretion). In this reality, when Nero destroyed the USS Kelvin, Jim's counterpart died as an infant. Jim is now on the Enterprise, where Chris Pike is still the Captain, and Spock his First Officer. Both of whom, among everyone else, knows nothing of him. (By this time, Jim has become a more mature person due to his Captaincy, losing most- not all- of his brash recklessness.)

Another major turn, in this Reality, is that instead of Vulcan being destroyed, Nero attacked Earth, devastating the planet into becoming inhabitable and its population all but extinct. The surviving Humans have moved to nearby colonies, some even staying on Vulcan, as it is one of the closest Federation-aliged planets to Earth. Until Jim can find a way to return to his realm- if he even decides to return-(where his Spock is in a commited relationship with Uhura), he has decided to help the people in the alternate Reality.

Guess everyone will get to learn who he is-all over again, including a curious- and single- Vulcan First Officer. Eventual K/S.

BONUS POINTS: In the alternate reality, Bones is still married, Uhura and Scotty are dating, and Spock is slighty more accepting of his Human side. (His mother still lives). 

BONUS POINTS: Spock finds Kirk to be an extreme enigma- one he relishes in unravelling.

BONUS POINTS: Kirk finds this new Spock just as attractive as the one from his realm, yet unique in his own way. However, he is hesitant to let his attraction grow because he may have to return home soon. (Despite this, his attraction intensifies nonetheless as he comes to know the Vulcan who is so much like- yet entirely different- from the Spock in his reality.)

MEGA BONUS POINTS: Until Kirk can find a way to return home (assuming the author wants him to return home), Kirk is given a position on the Enterprise, in order to put his talents to good use. Maybe in Engineering?

ENDING: Up to author- James can stay in new realm to help rebuild/stay with Spock, or return to his realm. HAVE FUN.

This challenge just called to me and I am going to try and include everything. I can see that this is probably going to be a long one. Wish me luck.

Kirk invites McCoy and Spock to a birthday party while they are still planetside.  As the night progresses, recollections surface, realizations are had, and everyone - except the underaged Chekov - enjoys a few drinks. 

Follows "The Dawn in Desinence" and is Fifth in the Metamorphosis to T'hy'la Series.