Season 7:

Future Tense (http://checkthemargins.livejournal.com/46310.html) by checkthemargins
Summary: Three days after icing Dick Roman for the last time... (Sam/Dean)

Season 8:

Rough Riders (http://archiveofourown.org/works/813780?view_adult=true) by rikvkat
Summary: From two spnkinkmeme prompts seeking a Sam who likes rough sex and a Dean who doesn’t like it nearly as much, but won’t admit that until Sam figures it out. (Sam/Dean)