Plagiarism heads-up Vedemsie on FanFiction.net has stolen several Snack, Snape/Lupin/Black and Snupin stories, renamed them, but otherwise put them up whole. The stories are from several different authors.
http://www.fanfiction.net/u/2215223/VedemsieI reported every fic I could find through an easy Google search, but there are still several others I couldn't find but am sure I recognize. You might want to check this person's story list.
love, lore