Technically it's stealing even if you do credit me properly.
Edit: Let me clarify. I have no problem with my work being indexed as long as the link provided is to my site or an approved archive. That is not what this person did. They copied an entire story to post on their site, with credit, but still without permission.
My website, my fanfiction.net page, any LiveJournal community that I post to are the only approved archives for my work. I am indexed in other places, the fan history wiki for example, but only with links back to one of the approved archival locations.