[Clint, Steve & Natasha]
Natasha watched Sam approaching; even in a situation like this where they were supposed to be safe she couldn't unwind, didn't relax because it was important she didn't let her guard down. After all, a promise or not there was no guarantee this wouldn't get crashed by someone unpleasant.
As it was, it was just Sam approaching with a warm smile and an equally warm hand clapping on Clint and Steve's shoulders.
"Pretty sure there weren't meant to be murder-bots at the last party," she pointed out with a chuckle, "I'm impressed at the spread you've put on, Sam, you're in the wrong job. Party planning needs you," she teased.