Turns out this "author" on Archive of Our Own, or AO3, took Needing You and then tweaked the characters and paranormal aspect into a Teen Wolf fan-fic. They copied the story arc, the scenes, and sometimes damn near identical dialogue, so it's very obvious they took a copy of my story and just went through making small edits rather than writing their own story.
I've reported the story to the site, and hopefully they'll get it taken down sooner rather than later. If you know this author, or are an account owner there, feel free to blast them like the thief they are!!
Plagiarist: Lost Boyz
Stolen Story: The Sub Whisperer