I've been looking everywhere for this story and can't find it. I was sure that I read it on archiveofourown, but I haven't been able to find it again.
The plot is: Jim and Spock meet on Tarsus IV, I'm pretty sure they meet because some kids are bullying the 'aliens' on the planet and Jim steps in to help Spock and another child. When the massacre happens, Spock and Jim run with a few other kids (alien?). Spock has problems meditating and Jim works really hard to look after everyone. Eventually, they get hold of a communicator and Spock manages to message his father for help.
Once they're rescued, Spock's parents adopt Jim (I can't remember why). Jim calls Amanda the vulcan word for mother (I think it's ko-mekh but I'm not sure). Jim and Spock are thy'la but I think it was more a brother bond then romantic. It ends with them at the Academy, Jim is a captain and Spock is talking to Uhura.
Any help would be much appreciated.