Canosan

If anything, it would be the Hentai Foundry member who would have either posted there under another name, which is not likely looking at both profiles, or it was the HF member who plagiarized the AFF member. The AFF member posted the story in 2011, whereas the HF member did not post it until 2013.
We always appreciate vigilant readers. However, this does not appear to be an instance of an AFF member committing plagiarism. I will, however, reach out to our member and alert them to the post on HF, should our member wish to pursue it with HF.

The story on AFF was posted here over 2 years earlier than the story posted to Hentai Foundry. As much as I dislike plagiarism in any form, I can’t see any reason to suspect that the AFF member has done anything improper.