http://hp.adult-fanfiction.org/story.php?no=600018513
is a copy of the first two chapters of
http://www.fanfiction.net/s/1609200/1/A_Thread_Of_Innocence
It could be AthenaLinborn posting under another name, but I doubt it. She has not updated in almost a year, and she posts at ff net. I sent her an email through ff net to let her know.