There's a bunch, just not as mainstream as in japan, example:
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superheroine kidnapping, rape stuff just like the japanese giga videos.
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some rape (tentacle & otherwise)
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monster rape
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rape, snuff
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rape, snuff
As for NTR, I don't bother with western nor japanese NTR videos for the same reason I don't bother with fakecest videos. It would require decent writing, acting and directing for non-autistic western adult viewers to be able to suspend their disbelief. Something porn studios are neither capable of nor willing to do.
Better off trying to get your story-related fetish fix from comics, games and mainstream movies/tv shows.