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It's supposed to be NTR and I usually try to avoid NTR since it's depressing but here it feels like a pure (and erotic) love story between a wife and husband's bratty (albino, shut-in, futanari) sister in law.
I checked and I think it's ok but it's possible I may have skipped a page or two. Tell me if I have made such a mistake and I will reupload it.