Someone I follow is posting about Spock and McCoy after the Katra sharing, but they're posting canon thoughts and I'm all fanon so I'm making my own post lol
Spock swears in Southern when he's tired. He really doesnt like this
McCoy understands a bit of Vulcan, but only when he doesn't know the person isn't speaking English. Like, if they randomly switch to Vulcan he can keep up until it's pointed out
They can feel when the other is experiencing strong emotions. They don't know what emotion, but it's like an itch or a tickle in their throat to say the other is feeling something
They know a bit of each other's specialised knowledge. McCoy is passable at astrophysics now, and Spock is an even more annoying patient since he understands the terminology
They also remember a few private moments of eachother's that they weren't present for. Both politely don't mention this, but do find confusing ways to allude to it
McCoy can cook some Vulcan dishes now. Spock developed a taste for bourbon in the evening that takes everyone by surprise
With great effort Spock can project messages to McCoy. With greater effort McCoy can give Spock a feeling that translates to fuck off
On Vulcan they're legally super duper married and Spock just doesn't mention this. McCoy notices next tax return when he's taxed like a married man, not a single man. Takes him months of asking around to figure out who the government thinks he's married to. He files for divorce without talking to Spock
Spock won't divorce him cos he did carry his Katra, but he'll agree to an annulment. McCoy about pops off with anger
Kirk buys them a wedding gift when he finds out
They don't get the annulment and neither can really put their finger on why. Something about respecting Vulcan culture, cos they'll still be married on Vulcan no matter what
McCoy gets a headache whenever Spock mind melds with someone else
McCoy can initiate a mind meld with Spock, which they both get kinda very into cos their brains feel so good paired back up again. McCoy drunkenly described it as being better than sex to Kirk and the idea of that sticks around something terrible
Their telepathic connection is stronger after a meld, so they start doing it in advance of missions so they can be in touch immediately if things go sideways
If they're apart for a long time the connection will tell them when each other is close by. They've run into each other at conferences or in hotels or once on a transport ship they didn't know the other was booking too. They find each other quickly and easily when they're nearby
This becomes an uncanny capacity to always vaguely know where the other is. McCoy is bad at remembering that he shouldn't know and will volunteer Spock's whereabouts sometimes without thinking
They get good at learning what the various nudges and hints from their connection mean. They can tell different moods apart and send messages that the other can open at their leisure, rather than breaking through and being front of mind
If one of them is injured or captive or just bored as shit they'll sometimes pop into the other's head and basically turn into the back seat driver from hell
With everything they know and learn, they're very fond of each other
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