My thoughts on how Shiro and Keith know each other and Keith's reaction to having Shiro home safe and sound-ish.
With the others chilling in his living room, Keith studied the sleeping face currently on his pillow. Shiro had been gone for so long, Keith had thought he was dead! Yet, here he was, and despite the arm, the scar, and the fact that his hair was the same color as an eighty-year old's, Keith couldn't be more relieved.
"Don't! They're coming! You have to understand!"
Shiro's outburst made Keith jump, but he was quickly in front of his surrogate brother, trying to calm him down.
"Takashi, hey, it's me, it's Keith, remember?"
Shiro blinked carefully and studied Keith's face for a minute before smiling, "you're safe."
"I'm safe! I thought you were dead! I thought you were…." And suddenly Keith was crying, when did he become so emotional?
Shiro smiled and hugged his little brother, "yeah, cadet, I know. I'm here though, I'm right here, and I have something I need your help with."
Keith didn't let go of Shiro, "you do?"
"Trust me, we're going to need all the help we can get, sound like a plan?"
Keith grinned, a rare sight really, and it made Shiro smile too.
"Dude, you came back from the dead, of course it's a fucking plan!"