About the Flesh Vortex

The Flesh-Vortex is a universe only consisting of the guts of some unlucky soul that was the victim of some experiment. Nobody will ever know the details because then entire set-up and involved personal was swooped up, obliterated and absorbed during the accident. 
The resulting dimension itself has still the primal cravings of the individual that it was founded with, so eating and mating. 
It is powerful enough to create portals to other dimensions/universes/planes of existence/branes/whatever you want to call them, but the vortex has no mind to control that power so the portals are rather random, but home in on organic sentient lifeforms. 
Portals only can transport organic creatures, sometimes including their clothing if it is not to thick or loose. 
Portals created by the Vortex are one-way trips into the vortex, even if by chance a mutant or demon was close by, it could not traverse it and enter another world. 
The vortex grew over the course of millennia to a vast expanse of deformed flesh and guts, slowly and inevitably absorbing each and every victim it ever trapped with one of its portals. 
The source of its energy is unknown, as it does not digest its victims, yet produces a constant stream of corruptive reproductive juices and liquid waste. 
The caverns walls are slick and wet and the air humid and musk laden, with occasional puckered holes that expel moisturised air. 
The victims inhabiting its cavernous guts are forced to feed upon those juices and slowly become corrupted and mutate into mockeries of their former selves or completely beyond any recognition. 
Unless of course there are demons or mutants of the vortex involved. 
The bodily fluids of the corrupted inhabitants of the Flesh-Vortex cause a much faster spreading mutation and psychological descent than the unprocessed liquids the Vortex itself put out. 
The peasants of the Vortex are categorized by their ability to control their own form and the form that others acquire after consuming their fluids. 

– Demons or Avatars of the Vortex can control their own appearance and the changes occurring in those they taint. 
As their mind is completely lost into the ever-boiling primal urges, their appearance often enough is revolting to outsiders and newcomers. 
Often enough they have no features on their form that still resemble their original form they entered the vortex with. 
They are almost always aggressive and dominant, forcing others under their thumb and fighting among each other for personal harems and territories inside the vortex. 

– Monsters are fully corrupted and can control the appearance they can pass onto others with their taint, they can't change their own bodies at will though. 
They often are mindless and only driven by instinct, rarely there is one that still can think any coherent thought, let alone voice it. 

– Sluts and Mutants are the bottoms of the hierarchy, feeding of the other two groups and serving them, some out of fear, most of the older sluts out of lust. 
Their bodies come in all imaginable shapes but almost never offer them any form of dignity or advantage over others, often leaving them with mostly gaping holes ,aching cocks and blue balls. 
Their mental condition ranges from mostly intact and fearful of the aggressive oppressors to completely gone and willingly bending over for anything crossing their path. 

Over time the Vortex has become large enough that it formed dozens of layers of cavernous gut over one another. 
As one goes deeper down towards its core the amount of filth housing its bowels increases and the condition of the inhabitants gets worse. 
They are plagued with infections ravaging their bodies and parasites housing them like a shell. 
The deeper down one comes the more likely it is to see bodies half absorbed by the vortex, still twitching and struggling, calling out for help in fear or to be mounted in insane lust. 
If one could visit the very core of the cortex it would show as a gargantuan almost perfect spherical ocean filled with liquid waste and with hardly any creature other than mindless parasites. 
However any creature diving so deep into the vortex would end up torn apart by the corruption, dissolving into twitching bits that soon form new parasites to plague the others.