Apprehensive and Awkward.
He didn't want to be there, under the scrutiny of these new people, whose faces weren't really new, just horribly different from what he remembered and knew and missed.
She didn't want to be there, under the patronizing looks of these people, whose names and faces she knew, but who weren't really her friends, just terribly familiar people that she remembered and knew and fears.
You need to get out more, Ed said with his infuriating, know-it-all voice that he only used when he was worried about Alfons and his wellbeing and which meant he couldn't really throw a tantrum about it.
You need to get out more, Colonel Mustang said with his infuriating, order-but-not voice that he only used when he wanted to make sure Sheska would do what he said and which meant she couldn't really tell him to leave her alone.
There was apprehension in his steps and a bit of awkwardness in her smile, but they met halfway in the hall, while Armstrong made a long rant about the importance of friendship, Family Honor and, strangely enough, blue rainbows and Ed tried to dodge all those uncomfortable questions about 'where have you been' and 'what else have you done'.
They smiled and shared the sure knowledge there's at least someone else who was dragged into this mess, apprehensive and awkward, and really, for a fleeting moment, their eyes met, conversation started and they suddenly knew everything would be alright. That it might even stay that way.