Regarding the fear of fans, dropping this manga from the Mangaka's history,
I personally am not convinced this web-manga is meant to shift to the dark ntr porn, at all.
I don't recall many, if any, dark Hentai Artist turned sweet romance manga creators (774 Nanashi, etc.),
but I don't think I've ever read cute romance manga abruptly shift to something negative.
Except for Gal Cleaning and another that I can't remember its name that got cancelled when the Mangaka got arrested, I think. Otherwise, all to say that this phenomena of manga is extremely uncommon.
Although, what I think the original post deluded and exagerrated everyone else's assumption is that alternate porn of a series means canon event or unquestionable transfer to the manga.
Thus, I'd like to clarify that porn from a Mangaka's creation is mainly not canon to the original story, and completely seperate as fantasy. Meaning it is not meant to be for the original story.
So, I think everyone needs to relax, and hope that we get a proper continuation of this potentially great sweet manga.
... To be fair, I could be wrong, but I don't see anyone actually translating and reading his posts or afterword of that porn version of the manga. So, until then, I don't know what the man himself says about this manga, if anything.