basically what i mean by the parasitism/petplay parallels is that its less about Being the animal (for me) or acting like the animal (for me) and its certainly not about wanting to fuck the actual nonsapient animal for obvious reasons, its about embodying the social idea of the animal role.
so im personally not committed to a particular pet species, i have cat and dog traits plus i like including practical aspects of actually being a humanoid sophont as a pet, its about being cared for in a somewhat demeaning/dehumanizing manner as someones inferior and treasured property.
so similarly, parasitism kink for me is about the social role of the parasite as a creature fully dependent on its host in many extremely intimate ways, forced to siphon nutrients from the host while having much less power than them, widely hated for the inherent nature of its lifestyle outside of a small group who look deeper and appreciate it for what it is. theres a lot of overlap with the dynamics ppl use for submissive vampires.
with the parasite domming its a lot more straightforward, just taking stuff from the sub for its own gain n stuff, but its important to remember the vulnerability too imo. there should be a level of desperation and possessiveness IMO. the parasite does Need the host thats extremely important.
but now that weve laid the groundwork lets not forget the details. details are what differentiates specific kinks from eachother and the general concept of d/s. things like accurate clicker training carry the whole kink and distinguish it as "petplay" rather than "crawl and dont speak cuz its hot and im your dominant". so heres where the wikipedia pages come in. the things that distinguish parasitism from just oviposition, eggpreg, fucking aliens, vore, hematolagnia, or even just "typical d/s with ppl who are very intimate"; are the details. its not about committing to a species (for me) but about the atmosphere and headspace. plus you can get a ton of ideas for scenes and fantasies from real life.
things like training in petplay can overlap with other kinks such as hypno, feedism, and various types of bondage. so similarly, parasitism can overlap with woundfucking (twistwings, bedbugs, arguably many parasitoid wasps), any other s/m really, hypno also (glyptapanteles, some fungi but its complicated), forcefem (sacculinas, arguably other castrators); there are endless possibilities but people just get so boring. there are words and tags for ovi and eggpreg if thats all youre doing. theres a tag for bugfuck too. im evil i want to fuck open sores. im here for open sores. everybody else is just doing stupid regular barely parasitic oviposition instead of what Really Matters (open sores). lets jack off the the wikipedia page for leishmaniasis Together 🫴