"Bargaining" is brilliant - one of the best Loki stories I've ever read.
I can't think of anything else that fits your request exactly, but if you don't mind self-reccing or "future self", I wrote this one:
Reweaving http://archiveofourown.org/works/1721930 Loki’s future self comes to warn him that his current path leads to destruction. But Fate is not an easy thing to change. Set entirely during the events of the movie “Thor”. Thorki slash.
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I can't think of anything else that fits your request exactly, but if you don't mind self-reccing or "future self", I wrote this one:
Reweaving
http://archiveofourown.org/works/1721930
Loki’s future self comes to warn him that his current path leads to destruction. But Fate is not an easy thing to change.
Set entirely during the events of the movie “Thor”. Thorki slash.