I used to write Harry Potter fanfiction (and occasionally still do, as fanfic retirement seems somewhat flexible), the majority of which feature Remus Lupin and Nymphadora Tonks. There are also some Marauder-era tales and the odd venture into AU. Other stories, such as R/T drabbles not published here, can be found at my fanfic journal, gilpins_tales, over on LJ.
If you're an R/T fan as well, you may enjoy rt_morelove, a LJ community now on Dreamwidth. And there is always metamorfic_moon, a LJ community which is no longer active, but with over 500 fanworks, both fic and art, archived there.