Multiplicity

I know terms are used and redefined, this just seems kind of an odd placement of an existing term, you see.

I have always thought that was really the wrong word to use for it, but it seems to be pretty emplaced now, and it's hard to get people to switch terminology just like that. You're right, though, the original meaning of the word 'soulbond' was along the lines of what's described in this article (http://www.otherkin.net/articles/soulbonds.html).

I'm guessing that when fanfic writers started using it, they weren't aware of it having another connotation.