There is "Off the Record" by Hella http://archiveofourown.org/works/315889?view_full_work=true Still a WIP, but "hot, fierce and rough" should fit this story pretty well. Loki certainly isn't tamed in this one.
Also, you could give "All the way down" by icarus_chained a try. There is some Pepper/Tony, but it mostly focuses on Loki/Tony. http://archiveofourown.org/series/18482
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http://archiveofourown.org/works/315889?view_full_work=true
Still a WIP, but "hot, fierce and rough" should fit this story pretty well. Loki certainly isn't tamed in this one.
Also, you could give "All the way down" by icarus_chained a try. There is some Pepper/Tony, but it mostly focuses on Loki/Tony.
http://archiveofourown.org/series/18482
Hope this is what you're looking for.