Summary:
At the end of the 5-year mission Spock is 'offered' a promotion. He resigns instead, and Kirk spends months regretting his insistence.
Then Spock reappears on Earth. Everything improves... but oddly, some people in Starfleet Command take exception to Spock's changes. Hopefully talks with the Klingons go well – Spock has been very helpful.
➤ very funny star trek tos fic about admiral kirk, and spock deciding "fuck it all" and leaving starfleet to become kirk's secretary
➤ tbh I think these two tags on the fic capture everything you need to know: Kirk thinks Spock is having some sort of identity crisis, Spock already had the crisis and he's just embraced his slut phase
➤ kirk is so bewildered and spock is so serenely confident in everything he's doing and it's amazing to watch
➤ also there's a plot about ship sabotage and klingon ambassadors and stuff
➤ 50k words in length