I'm going to watch The Avengers movie again tonight. By myself. Possibly with a notebook.
So give me one or two characters from the Avengers movie (and broader universe) and I'll write an interaction between them. If you want to help it along, you can suggest prompts, topics, situations, or scenarios. Whatever works for you (and which will hopefully work for me).
I can't guarantee they'll be good. Or in-character. Or, you know, that I'll write them at all. But I will at least toss a few ideas around and, who knows? I might get bit by the bug over your idea.
Do be warned, though; I may not follow fannish expectations. (Unless your expectations are that female characters can be awesome and slash is not a priority.)