This is an interesting take on Tony; you've really emphasized the flashes of cynicism and darkness we see in the canon, and tempered it with sweetness; it really gives the feel he's opening up to Steve in a way he doesn't with many people.

And I liked at the end, where Steve was desperately wishing he wasn't there, even as he made the best of things - that's very Steve, always taking action even while he's hurting, maybe especially while he's hurting.