2 Works by ninety6tears in Marvel Cinematic Universe
It was a relief that Thor never noticed anything, but then, there had always been pretenses to her treatment of the brothers. In the company of both they were all friends from the battlefield, competitive and playful except for where her humble respect for the family was appropriate. But in Thor’s absence she and Loki had long had an understanding that she wasn't always taken in by him; she never spoke bluntly of his resentment of his brother but she glared upon it obviously enough, and Loki wasn't a fool.
Only a fool enough to think this game between them was only for his laughter, or her pleasure, as far as that could go.
Natasha can show him how to do a few things, but she may not be an expert on what those things are for.