Dude what the heck is wrong with people here? And you're telling me the reaction on socials were even worse so she had to uncanonise the extra?!
I don't get it, and I feel kinda bad for the author, even though I despise NTR.
Thanks for the chapter!
I'll try to explain what happened...
At first the story was supposed to be about a brother "correcting" his sister sexually while she sleeps so that she would stop feeling pleasure when she had sex with others and would only feel pleasure with her brother. Because of the ToS of the fanbox, stories with incest and sleeping are not allowed so the author had to "rewrite".
Basically the main story we have was supposed to be bait for the fanbox, but as it ended up attracting a lot of attention the author tried to separate the fanbox story from the "main" story but she did a terrible job (especially in chapter 4) with it because she literally left holes in the main story, which are the contents of the fanbox. You can see black bands in the chapters indicating where in the story the fanbox content takes place:
Chapter 2
Chapter 4
When the content of the fanbox (chapter 2.5) started to leak and readers noticed that the fanbox had an NTR tag and no indication that the story in the fanbox was not canon, they started asking the author if it really was NTR and if it was canon because the "main" story that is published on X and Pixiv seemed like it was going to be a wholesome story.
When the backlash started to rise,
the author removed the NTR tag from the fanbox and did not add a "what if" or "alternative version" tag.
Edit:
Actually, the readers added the NTR tag to the public Pixiv once they noticed it wasn't tagged as NTR. She deleted said tag, then locked the tagging section. Tiny difference there.
On X she started blocking people, published a lot of complaints and even opened a live where she said a lot of absurd things. She later deleted the posts and deleted the live. There's a
small summary here but if you want more details about this episode you can read about it from the first page of the attached comment's forum thread.
With the release of the new fanbox chapter (chapter 4.5), which basically confirms that the fanbox content is canon because of the events of chapter 4, the author was then asked on X if the fanbox content is canon and as you saw here, she said it's not canon. As she denied it, I asked what the context of chapter 4 is because it doesn't make any sense without the content of the fanbox. As expected, she didn't respond.
Summary: Fanbox bait gone wrong.