Pepper and Steve sparring?

[janne_d]

This is only a tiny little bit of a fic that I can remember - Pepper is learning to control and use Extremis by working with Steve (I think partly because of his experience of his abilities changing so much with the serum and partly because he'll heal if she burns him?), and I'm pretty sure they sparred together. And I have absolutely no idea what the rest of the fic is, if there is a larger plot, if there are pairings... no clue!

Any suggestions?