Gene Roddenberry: lol I’m totally gonna make Kirk and Spock Soul Mates HAHHAHAHAH how great is that right like actual soul mates heck I’m even gonna make up a word for it in Vulcan to make it even more legit t'hy'la it is YUP YESSIR Vulcan soulmates not just ur regular earth soul mates but like ancient Vulcan desert warrior bond soul mates ENJOY NO NEED TO THANK ME just send a fruit basket maybe cheers Gene out .
I love the idea of Spock falling in love with Jim first. It’s this steady progression of emotion starting from the day they meet, and building over years. Little moments feed into it, to the point that he doesn’t know exactly when it began or if it would ever end, just that it’s been happening all along. And he’s okay with it. Just like, “this is a beautiful emotion, and– even though I’m not supposed to feel it– I’ll treasure it. And him.”
And so when Jim finally wises up and realizes what’s been under his nose the whole time, when he finally has that “aha” moment, Spock (who has been content to just love him with no expectations) just feels this culmination of the inevitable. And it takes him no time at all to return Jim’s affections because he has had years longer to absorb and reflect on his own.
I just think that’s how their individual realizations would go. Spock, steadily over many years; Jim, in one defining moment.