To Boldly Go, Together
A lot has happened to the crew of the Enterprise over the last year, from a rogue old-earth satellite, to a vengeful madman, to resurrection, to time travel. There's been a lot of upheaval, and as they grow older Spock hopes to make at least one element of their chaotic lives more stable. Kirk and Spock have been inseparable for decades. It's high time they made it official.