Here comes the rugpull, but the author decided to cushion Himari's fall (a little) by only having onii-chan tell her the news, that he's become a full-fledged hentai protagonist not outright show it to her complete with gloating wife and annoying kids.
It's so over (real) <- we are here, now I'm sure
I wonder where this goes for the last chapter... this was a sputter of a wet firework in the end if it continues like this. I guess technically there's still one last chance for this to go out with a bang, but I doubt it...