The Preying Mantis’ Nest [English], by Arai Kei (Also known as kansai Orange)
A scumbag son whose fetish is to steal his uninvolved and impotent father’s wifes, meets the woman who will turn seriously bad when exposed to his vileny.
There’s so much more than I would be willing to write, however I’ll have to resist. You see, this share is very much story-driven, with a spiralling movement towards what we realize is an inescapable end.
If you insist, I’ll provide just one biblical spoiler.
If the preview images suit your tastes as far as drawings go, I’ll beg you, try to resist temptation, stick to reading the story from the beginning, without jumping to the end at once, it would be too bad.
Desudesu is behind this release, I can’t say I adored it, but it left me with a strong impression, so, thank you
EDIT: this story is now part of a complete volume, called Houkago Hinitiation. You can view it in two versions, in its full-colour version (but with hideous censorship) or in its grayscale tank version (still with heavy censorship, but not “OH MY GOD THIS IS ATROCIOUS” levels of censorship, still ).