Merlin rolled his eyes, moving inside as Arthur allowed him so. "It's good to see you too, Arthur," he told him, looking around a development that seemed almost identical to his own. He wanted to ask just how much Arthur detested his new living quarters, but thought against it. Merlin knew when there was a time and a place, and this definitely wasn't either of those. Instead, he waited for Arthur to close the door before asking, "So... How are you feeling?" He probably knew exactly how the prince was feeling.
Scared, aggravated, curious, restless, and perhaps most of all -- alone. Though they may have had each other, it was still a feeling that palled on Merlin greatly.
Now that he was stranded here, in the year 2008, what was he to do about his magic? How could he use it now without being able to speak freely with someone close to him? Gaius was no longer around, no longer available to chide him for using it to clean his room or helping with the chores. Could he really hold his secret from Arthur?