I have an idea, but I do not have the literary skill to pull it off myself, so I am issueing it as a challenge instead.
Setting the scene:
It is a ways into their five year mission and Captain Kirk and Spock have an establish relationship. However, do to it being taboo for a Captain and his Commanding Officer to have a relationship and them not wanting to be the main point of gossip across the galaxy they have kept their relationship a secret from the crew. Maybe Bones knows, but that is it.
Something goes wrong and the ship is in impending paral. Maybe a powerful alien race is going to destroy it or the engine are died and they are getting pulled into the sun. However you think is a believable way for the whole ship, including all of the crew, to be potentially destroyed. Captain Kirk, Spock and the crew, try everything in their power, but it looks like they have 5 minutes to live and they are out of ideas.
1) Create a very public goodbye scene on the bridge, filled with loving words, kisses, and strange looks from all of the bridge crew. Note: Jim and Spoke are soulmates and the thought of their life together being cut short it unbearable.
2) I like happy endings, so find a way for the ship to be saved in the last possible minute
Bonus Points if:
-All the TOS crewmen are at least mentioned if not actually active characters (Chekov, Sulu, Uhara, Scotty, Bones)
-Flashbacks of Jim and Spock's relationship are included (with sex, because their should be sex in every K/S fiction, but they obviously can't have it on the bridge when they are all about to die)
-There is a slightly awkward, but humourous ending, since they didn't end up dying but now everyone knows
I hope someone likes this idea and runs with it, have fun and thanks,
Characters: Chekov, McCoy, Original Character(s), Sulu, Uhura