“Elves, bored by she-elves, court the always-willing human females. Bored she-elves give themselves, out of perverse curiosity, to human males, always full of vigour and verve. And something happens that no one can explain: she-elves, who normally ovulate once every ten or twenty years, when copulating with a man begin to ovulate with each powerful orgasm. Some hidden hormone, or combination of hormones, became active. She-elves suddenly understand they can, in practice, only have children with humans. So, owing to the she-elves, we didn’t exterminate you when we were still the more powerful
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