It was clear that the whole experience was difficult for him to handle. She had to contain some laughs, not because she was mocking at him, but because she felt a little nervous about the situation. The queen wouldn't let her ally alone without hints of how to recover, so she decided to use her royal authority. And for a second, her purple sight turned tough.
"If your queen says she will take care of you, nothing can change it. It's my duty to watch over my people."
Then Daenerys would put her right hand on his shoulder. "I'll take you to your tent. Missandei, please. Follow us with some more water, please". Her subordinate would obey immediately. She went out for water and came back in a few seconds. Meanwhile, the queen was trying to help Castiel stand up. She was small in comparison to him, and lacked of physical strength. But she would give her best trying to hold him by his arms, until he was able to firmly put his feet on the ground.
The way to the tent seemed longer than usual, but finally they managed to get there safely. Missandei was just behind them, holding a jar full of water, and a silver glass.
"Please, lay down", she said. And without waiting for him, she sat on a corner of the rustic bed.