Well, as the person who initially made the page as tentaclefic, while I know of hentai, I've always thought that an original thing, and not really connected to fandom output in any close way, except that there are tentacles in both. But then the same can be said about lots of stuff. I never watched hentai and I don't follow any anime or manga fandoms. And the only fandom output with tentacles I could think of were stories. So yeah, in a fandom context I foremost thought of it as a fic thing.
Also because I think of tentacles as kink and that in my mind as far as fandom kinks go those are primarily something written not anything visual, probably because don't use pictures as porn myself. So while of course I know intellectually that a ton of people make use of visual porn, if I don't think it through deliberately any tropes I think of as kinks I think of as "such-and-such-fic" like slavefic, hookerfic, rapefic, etc. unless I keep in mind deliberately to be inclusive. And that is even though I don't write fic myself, but only draw fanart (if not often).
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Also because I think of tentacles as kink and that in my mind as far as fandom kinks go those are primarily something written not anything visual, probably because don't use pictures as porn myself. So while of course I know intellectually that a ton of people make use of visual porn, if I don't think it through deliberately any tropes I think of as kinks I think of as "such-and-such-fic" like slavefic, hookerfic, rapefic, etc. unless I keep in mind deliberately to be inclusive. And that is even though I don't write fic myself, but only draw fanart (if not often).