Yes, this is firmly AU, unless you'd rather like to think that, being rather young at the time, both Spock and Kirk forgot about their different-world penpal. Basically, whatever floats your boat.
Disclaimer: I don't own Star Trek, especially not the Reboot. If I did, Kirk would've had, you know, brown eyes.
"James? What are you doing?"
"Writing to my pen pal, mom! I just got his new letter!"
"Oh, yes, that - what was it - Vulcan boy, right?"
"Says he's half Vulcan. I asked him 'bout it, but he just said that it didn't matter for the, um - something something something confines something of our letters. He's kind of weird."
"Well, he is Vulcan..."
"What's that got to do with anything, mom?"
"Ah, nothing, dear. And honey, you shouldn't ask about things like that. Some people can get uncomfortable."
"Like when Mrs. Smith's new baby had blue skin instead of orange like his daddy's?"
"Er...yes. How did you hear about that, James?"
"Uh...Sam?"
"Thank you, dear... SAMUEL, YOU GET INTO THIS KITCHEN RIGHT NOW, DO YOU HEAR ME?"
