So let's get things straight. Rabbit and Owner was apparently intended as a prequel for a story the author has always wanted to do. When I say Rabbit and Owner, I'm talking about this story, ch. 1-19.
The last 2 chapters (18 and 19) are newly-drawn stories ONLY included in the
non-H Melonbooks compilation that has no raws anywhere (ch. 16 is probably the spiciest it'll ever be, since the compilation is sold as 一般向け "for everybody" and not 18禁 "R-18").
Do not confuse ch.18 and 19 with previews of the author's unreleased intended sequel (the so-called chapter 0 with a "Preview Ban" [Preview ver.] floating around; yes that is not chapter 18 and 19, that is from the WIP sequel) the author has been working on even before this story started.
That's what everyone should be afraid of, not ch. 18 and 19 which are probably either more fluff or setup chapters leading to a sequel. Leaving the nasty stuff to a sequel means people can choose to believe the story ended here or at ch. 19.
If you're talking about the infamous preview (the one with the プレビュー版 [Preview Ban] "Preview ver." in the title) that's from the unreleased, WIP sequel that has been floating around even before this story was finished. That is not Ch. 18-19 which is part of this
compilation that has no sex scenes.