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2 Apr 20th, 2017 at 5:05AMAnimeI noticed that in some Brother-Sister Incest plots MC "gets" a normal sister, after the main heroine turned out to be a non related sibling and became a couple with the MC. For example, a hero marries an adopted sister, after which it turns out that he has a native younger sister. If any trope, which is based on this, or similar to this?