Castiel tried not to trail his gaze along her body, because he might be familiar with sexuality thanks to watching over Earth for so long, but he often found their sex repetitious and boring. Uninteresting. Even if he'd been intrigued by the film with the pizza man and the baby sitter. It had created a reaction in him that wasn't like him, although he'd begun to feel various emotions and so forth, ever since getting close to the Winchesters and questioning his orders from his superiors in Heaven.
Then, there was Meg. The multitude of things she stirred up in him, emotions and the urge to protect and to do things that he'd only observed from afar, when he was simply watching Earth rather than participating. He actually found himself gulping a bit, not completely noticeable, but enough to where his nervous shift was proof he didn't know how to take seeing Meg like this.
He did as she beckoned and came closer, his steps slow and tentative as he tried not to move clumsily. He'd been seemingly together in his walk over here, but it was now that he was faced with her he was knocked back off guard because of her. She at least looked healed, that much he could take note of, so his gaze didn't linger too long.
"Yes, I missed you." He was honest, to a fault, about how he'd gotten so used to having her around. "The Winchesters came over, while you were away. And I see that your wounds have finally healed." Not that he'd seen them when they were fresh or even during the worst of it, but he was glad to see that. It meant that the protective urge he felt could die down a little, although he still wanted to keep her from finding harm again like she had before he got here and then recently, with the bruise she managed to get on her eye.