He smiled back at her, his grin the same up-to-no-good grin that he'd worn since the beginning of his existence and it was no less charming now that it had ever been. "It's good to see you too," he replied. And it was the complete truth. She was one of the very few people he wasn't worried about seeing again because he knew that she, like his mother, couldn't possibly hold his absence against him for long.
While Frigg didn't immediately reach out to hug him, Thor was forward as ever, leaning down and wrapping his arms around her - trying not to squeeze her too tight. "And you're just as beautiful as ever, Frigg," he said as he pulled back. Always charming, always full of compliments for the women in his life. And Thor was a bit of a momma's-boy, regardless of how he'd adamantly deny it.
"You've been working?" he asked, taking into account the time it took her to get to the door and the lab coat she still had on.