Thor

The weather was nice, so Thor shouldn't have been worried. In all truth, Tony had taken the suit out in far worse circumstances than "a clear day in the relative peace of their pocket dimension". Still, given Tony's recent newfound talent for falling asleep in new and unusual places, Thor couldn't help but be concerned that his latest new and unusual napping place might be "the sky in mid-flight".

"If you start to feel sleepy, you will land, right?" Thor's pretty sure his mother worried less openly about him, even before he left for battle. But Tony's human body was far more fragile than his Asgardian one, and there were occasionally moments even now where he remembered seeing Tony's body, racing towards it, and turning it over, not sure he was alive even after he ripped his mask off.

But Thor wasn't going to stop him from doing what he wanted; Tony was a grown man in his own right. The most he could do was ask that he'd be careful, whatever he chose to do and whenever he chose to do it.