It can be fiction or nonfiction.
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one paragraph of Twilight was enough..granted most modern romance is either smutty, or cliche, or poorly researched
There's this book called Dragons of the Valley by Donita K. Paul and as a writer I literally use it as what not to do.
It is painfully cliche and the MC is annoying and she marries the most perfect, characterless, boring man ever.
My favorite character is Belowmondore (the name speaks for the writing lol) but he's just a taller cliche version of Samwise Gamgee.