It's a bit surprising how much NTR exists in the most popular books. In fact I consider the NTR in the books superior to that of any other medium. In general, the characters in a book have their own interests and plots that do not focus solely on sex, so an NTR developed over hundreds and hundreds of pages with characters that you really care about is much more devastating and has many more consequences in this medium than in any other. In addition, the authors can be very wicked with their own characters.
A few more examples:
- Earth's Children (a long saga of novels by Jean M. Auel)
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- Sword of Destiny (The Witcher Saga by Andrzej Sapkowski):
- The Wind-Up Bird Chronicle (Haruki Murakami)
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