I'm trying to make my idea make sense. I wanted to create an parasitic/symbiotic alien species which reproduces/breeds by air or touch, which they are unaware of. They do not understand why their species keep being "born" in other species. They are intelligent and sentient but not highly advanced themselves. They learn everything secondhand as they take over a population. They may learn how to use technology but they don't always learn the inner mechanisms of advanced technology they find on new worlds so often discard technology too advanced for them and use what they can learn to use to further their survival.
Basically they're alien brains that completely replace our own brains after their "infection" reaches our brains, in which their male and female DNA comes together and creates a new growth which then completely consumes our own brains for the nutrients and then grows into their own sentient brains that take over our bodies. Afterwards, the host body sustains them through normal bodily functions and the aliens keep living. Their process of being born is "parasitic", but after they're born, they no longer feed off their host body and then use the bodies as if it is their own, like symbiotic species.
I came up with a way to help make sense of this by using our microbiome clouds, which we all have, which are microorganisms that are on our skin and around our bodies in the air, unseen by our eyes. They're mostly bacteria and viruses but harmless and a part of our bodies' natural ecosystem.
I wanted to further describe the process and see if it makes more sense in how they're infecting others when they invade other worlds. This symbiotic species has evolved to reproduce by spreading their genetic DNA within their own microbiome clouds. This is what I have come up with:
Alien microbiome cloud ecosystem:
Their microbiome is full of microscopic strange microorganisms that feed off the aliens’ microbiome cloud which is full of their DNA. The aliens constantly emit their DNA out into their personal microbiome cloud by sweat or breathing out, which the microorganisms then feeds off of their DNA. However there is so much DNA being emitted by the aliens that these microorganisms often do not eat it all and and so the DNA often sticks to them, much like bees and pollen.
When these aliens come into contact with other species, their microbiome clouds attacks and consumes other species’ microbiome clouds unseen and completely replaces them. In the process, these microorganisms shed the leftover DNA that's sticking to them down onto the other species through the air and onto their skin, which then infects them through their bloodstream when it’s inhaled or absorbed by contact.
It is a type of symbiotic relationship between the aliens and the microorganisms in their microbiome clouds, however the aliens are completely unaware of this process and do not understand why their species keep being “born” in every other species that they come in contact with.
Their microbiome cloud basically infects our own microbiome cloud in order to “infect” us through our bloodstream. Their strange microorganisms are in effect pollinators for the parasitic/symbiotic aliens. These microorganisms are not intelligent, it is just the way they evolved with the aliens on their homeworld and the symbiotic aliens thought their way of existence it was normal until they left their homeworld and started seeing their own species being born and taking over other aliens after first contact. They have no idea that their biology evolved to work in this way.
Does this work??