No worries for Thor -- surely he'd run into his sister again in the future. It was always a toss up, what Loki might decide they were in the mood for at any given time.
"There you are," Loki said not without some warmth of his own as he shifted to sit back some, balancing his height on his hands in order to give his brother one long look up and then another long look down. "I thought it best to be sure you weren't a zombie," he said after a pause where he was apparently satisfied with what he found. "You'd be absolutely dreadful as a zombie. Just unfortunate."