well, there's three distinct types i like that i'll delve into here. in my experience, it's difficult to find the specific parasite stuff i'm into so often i'm inspired by non-pornographic media that i then twist with the power of my mind into something to get off to. a common feature of these is that the infection is done through sex, so it's more like transformation through sex with a parasite or parasite infected individual.
the first one and the one that started all for me is the alien worm parasite. one can find this in various forms in sci-fi media usually, sliders was the show that actually implanted this fetish within me and has since evolved from there as i've grown. usually, this features a human (preferably a girl) being infected by the worm infiltrating their body by forcing itself through one of its many holes. my favourite is orally. once this parasite has taken over its host, usually it then commands it to find another body to breed with to spread the parasite naturally. now, sometimes this scenario doesn't feature much transformation itself. that's why how i like it and how i fantasise about it is the parasite transforming the body in response to the desire to breed. this involves pushing the body to its limit in inhuman and monstrous ways, enlarging reproductive organs and making them leaky and also turning them a red colour as if inflamed. i also like to add a feral aspect to it, usually removing the host's ability to speak and only leaving them able to utter primal noises such as hisses, growls and snarls. one can also just do The Thing (1982) but with girls and sex and that works too.
the next one is symbiotes. the concept i'm talking here i believe was pretty much invented by spider-man, with the character venom. specifically, an alien lifeform that bonds to you and you wear and co-exist with. unfortunately, it is quite difficult for me to find porn for this that is suited to my taste. there is a lot of disgustingly straight venom porn out there and also a lot of latex transformation which i personally think is boring. but if you dig, there is good porn of girls being taken over by symbiotes and being turned into breeders and then spreading their influence. in one specific instance, i managed to find a really, really hot animation of samus being raped by a faceless, humanoid purple mass of a goop-like substance identified as a symbiote. throughout the animation, she's subtly infected as she's being raped up until the bad ending where she's absorbed into the creature and made a part of it.
the last one is about a specific type of parasite that exists in real life, leucochloridium paradoxum, or the green-banded broodsac. this parasite is quite a popular niche. it infects the eye stalks of snails in real life, and thus is commonly depicted in porn as infecting the eyes of human girls usually from the parasite being transferred by an infected snail raping a girl. the transformation involves the eyes essentially being replaced, with the green-banded broodsac jutting out of the eyes and pulsating. other bodyparts are commonly infected too, such as the nipples and clitoris. sometimes, the skin turns green in response to the infection. there's an animator that does bug porn that makes leucochloridium paradoxum animations that i really love. they all follow a similar formula of a girl being bound inside a fleshy interior, with a giant infected snail raping her. it will cum inside her, filling her with eggs and start kissing her. an x-ray will be shown of her full womb and in some instances, she will immediately birth the eggs from her womb and the young will hatch and feed off of her. x-rays of her dna being rewritten, represented by it turning green, and of her fallopian tubes being infected will also be shown. then, her body will start changing with the various body parts growing green-banded broodsacs, like the eyes, boobs, clitoris and maybe even the forehead. green-bands may even appear on the arms and legs and as mentioned, the skin can turn green. a lot of leakage is depicted commonly in both the artist's animations and porn of this in general, with green goop in the animations covering the girl and the broodsacs being seemingly wet and dripping.
i love parasite transformation for a few reasons, being interspecies mating, loss of identity with the transformation into something inhuman and unrecognisable, and the bad endings commonly depicted in such porn.
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