1. http://archiveofourown.org/series/32075 Kingsverse by nayanroo. 5 stories completed, #6 is in progress. It's a Thor fanfic and I think it got jossed by the Avengers, although they still get to play. Not exactly what you ask for, but well done.

4. There is Frigga intensive fanfic where the Idiots 4 have to choke on pardon from Loki. Can't recall the title, maybe someone else can help.