Ah, took me a minute to find it. Not sure if this really fits what you're looking for though.

Burning out my sins until there's nothing but dust (http://archiveofourown.org/works/800409/chapters/1507999) by brandywine421

Um, it's eventual Tony/Steve, Bucky/Natasha. Not graphic or anything, but it gets into how Steve was dreaming while in the ice and how he deals with it later.