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Stories for adults, based on, or including elements of fairy tales, are quite common. For example, Neil Gaiman's Snow, Glass, Apples is a retelling of Snow White, with an evil vampire Snow White an...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/41868 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/41868 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Stories for adults, based on, or including elements of fairy tales, are quite common. For example, Neil Gaiman's _Snow, Glass, Apples_ is a retelling of _Snow White_, with an evil vampire Snow White and a necrophiliac prince. "Not for children" doesn't begin to cover how dark and creepy that story is. I would say, this trope is so common, **there's no reason why your readers would expect the story to be for children** , unless some weird decision by the publisher makes them think otherwise.