I like having limitations on sex with small girls in any porn that features them:
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They cannot become larger, you cannot become smaller.
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They cannot stretch or deform their bodies in order to have sex with humans.
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They do no look like a subspecies of human, but like an entirely different species from us, and they are a completely separate species from us, there are males, with which they can reproduce, and they are sexually incompatible with humans, meaning they cannot reproduce with us.
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Since sex between the two species was never meant to be by our evolutionary history or designs, when the sex does occur, it's focused on pleasure, not reproduction, and has to work within the natural limitations, it is interspecies, but not bestiality since both species are sapient and capable of communication with one another.
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Sex is entirely non-penetrative due to the size difference, involves lots of rubbing, kissing, tasting, etc. Typically the fairy girl tells her human lover to simply expose himself, lie down, stay still, and enjoy the show as she does all the work, she enjoys making herself vulnerable as she devotes her entire body to sexually pleasuring this larger, more powerful being that could crush her at any time if he wanted too, but won't, because it loves her, once making contact with humans, fairy women flocked to human men because of this kind of psychological thrill, one that very much plays to the sexual psychology of the female mind.
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Also because compared to fairy men, human men are perceived as bigger, stronger, more dominant, etc., and they are also as exotic to fairies as fairies are to them.
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Navi and Proxi are working together on "polishing" Link's "sword" right now.