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So i just learned about this thread and realized that, if people likes symbiote and parasites, they could have their own take on it here First, how does the parasite work ? The parasite is a living goo organism that needs a host to thrive, unlike most parasite on earth, this one needs its host alive and will do anything to keep them alive. Each parasite will infect a man with different effect depending on the host dominant personality trait, they all end up as big or bigger than any bodybuilder that exists, their cum produces a huge amount of protein but they cannot reproduce outside of the breeder who is the only one with working sperm. All of the men corrupted by it can have tendrils that can serve purpose such as feeding or filling someone with cum. There are multiple types, each with special perks. Generator Personality: Lazyness They are completly immobile, they cannot move but have tendrils inside their nipples and belly button, once they see a parasitized man, the tendri's automatically goes inside the pecs and cock of the man which acts like viagra but also feeds them and grows them. Power Personality: Bragger They are very muscled with not an ounce of fat, they try to put on a show and show they are the biggest, they actively search for generator to grow more and they try to absolutely dominate the submissives types, when 2 power types meet, the strongest fuck the weaker which leaves him with a belly full of cum. Submissive Personality: Kind They are very muscled but less than the power types, instead their ass are bigger, they want to get fucked constantly and absolutely wants the biggest power types or breeder. Breeder Personality: High Libido Breeders are beefier than Power types to seduce submissives and the blow types, they have the biggest balls and amount of cum, they are the only one with working sperm cells, they constantly need cumming, if left without cumming, they become wild, they are surprisingly fast and agile despite their huge balls and muscles. If it could impregnate a man without a parasite, it is very likely that the man will end up pregnant even without any ovum and god knows what would happen if they had one. Seducer Personality: Charming Seducers are incredible manipulators, they usually take a very normal looking body, looking like a pretty sportive man and seduce their victims, once they are invited to have sex, they reveal their huge musculature, their pheromones hypnotize their target and he infect their victims with the parasite, whenever a blow releases a flood a huge amount of parasite gets in a seducer's balls, waiting to infect. Blow Personality: Gluttony Blow are pretty much the mother (or rather father) of all parasites, when infected an egg starts forming inside of the man's belly, they quickly need to eat, then a breeder comes and quickly fuck them, the cum quickly accumulate and fertilize the egg, it creates more and more parasites and goes on until the host belly implodes and releases a flood. The parasite makes sure to regenerate the host's belly and for their body to stay intact. Monster Personality: Unknown It is unknown how they exist, they are the result of the host dna corrupting the parasite itself, returning the parasitizing so the host acts as a parasite himself. They have complete control of their body, they feed from any parasitized man's cum, making it grow bigger, they also try to drain any human's muscles hosting a parasite or not, the body description is hard to tell as the monster type can change their body as they please, they can add another cock, more abs, etc... They can be huge or tiny and change their size at will. You are free to add more species of you have ideas

David and Yvan are two bodybuilders, they've known each other and competed against each other for years but always trained at the gym together. Yvan is a big glutton, always stuffing his gutter with so much food that restaurant usually kick him out. Meanwhile David would always hook up with lots of guys, especially with his friend Quentin as he always text him every few days for a hook up whenever he didn't had anyone to fuck. They walked down a forest at night after the gym. David: That was a good day at the gym wasn't it ? Yvan:Yeah, i'd be down to eat something David: Always hungry aren't you ? Yvan: Don't judge me, mister sexy man ! You always need to fuck something David: How is that a problem when you have these pecs ! David flexed and bounced his pecs as Yvan laughed The two men saw a shooting star as they walked down the forest David: A shooting star ! Yvan: Hmm… It looks awfully close ? The two immediately realized it was about to crash and they ran in another direction as they heard a loud crash. David: Are you alright ?! Yvan nodded and they both went to look at the meteorite that crashed, all they saw was a pulsing black rock. David took a stick and started to poke the meteor. Yvan: Don't do that dude ! David: I wanna know what this is ! Yvan: Better just leave it, could be some weird alien substance David: Pff, what ? You think that's like spiderman's symbiote ? David laughed as Yvan sighed. Yvan:Just leave it be, it could be dangerous The two went out, but the meteor opened and 2 goopy parasites came out of it and followed the two. Yvan:Imagine if there was actually a symbiote, wouldn't you like it ? David:If it makes me have bigger muscles I'd be down ! Yvan: Me too… Especially if its tentacles would bring me food into my mouth David: Glutton… Yvan: Says the dude with 3 hook ups a week David: Not my fault if i'm the hottest man in those gay bars ! Yvan laughed and both went home, the parasites followed quietly, they ate and then went to sleep in their respective houses. The two parasites entered and approached the two men in their sleep. The first parasite approached David's cock and started sliding inside his urethra and into his balls as David moaned in his sleep. The second parasite approached Yvan's belly and started sliding inside Yvan's belly button, Yvan moved in his sleep and the parasite slides inside his belly Both parasites started to assimilate with their host and start their upcoming mutation. The next morning both men awoke, Yvan felt extremely hungry as he went to his fridge and ate a bunch of food. Meanwhile David jacked off and cummed for about 5 times in a row. Both men started to dress up and went to the gym where they saw each other. David: How are you feeling today ? Yvan: Hungry… Really really hungry. David:Always hungry are you ? I would have suggested that we go to a restaurant but… Yvan:Got more hookups to fuck I'm guessing ? David nodded with a grin and both started to work out, as both men were working out, the parasite was growing, one was feeding off almost everything Yvan had eaten while the other fed off from David's libido. They worked out for several hours as they were progressively having trouble focusing and both stopped, David's cock was arching up, begging to be let go of his pants and Yvan's belly gurgled loudly David: Ugh… Yvan: What's up ? David: i feel too horny today Yvan: I see, i'm too hungry personally… See you later man David nodded and waved as they both went their way. David texted his friend Quentin and told him he'd come for a hook up and Yvan went home, opened his fridge and started to eat. David went into the apartment of his friend Quentin, he is rather slim,almost looking like a twink. David knocked on the door quickly. Quentin: yes ? He opened the door and David immediately lifted him up and went to the bedroom, throwing Quentin onto the bed. He undressed himself and Quentin undressed too with a grin, he was liking what was happening. David put on some lube and immediately started pounding Quentin's ass, the parasite was urging him to fuck him and so he did, violently pounding Quentin like never before. Quentin screamed in pleasure, David pounding his prostate with so much force he was already cumming, David felt climax approach soon after and with a roar he started cumming but that wasn't the usual cummings, this time he was unleashing so much cum that Quentin's belly started to bulge, bigger and bigger. Quentin:Wh-HAT THE ?! Quentin was getting fatter and fatter as David kept cumming more and more. Quentin:DAVID I'M- HMPF ! Cum was getting into his mouth, this was too much cum for him, He saw on David's abs a strange form, a bulge moving inside of him before disappearing, suddenly David's veins got dark and his muscles started growing, quickly Quentin's belly hid his view of David as he came like a firehose, until it eventually stopped. David pulled out, panting. David:That was… He looked at Quentin, he was looking overweight, his belly had quite a lot of stretch marks, David should be worried about what just happened but instead, he had a huge grin, he looked at his muscles and flexed. He always wanted to act as an alpha. Meanwhile Yvan ate and ate, so much his belly started to get fatter, his bodybuilder's abs replaced by an off-season muscled gut. The parasite moved inside his belly, his belly pulsed and he gained 20 pounds as he ate. Both men later on went to sleep but unknowingly they gave the parasites more power, as they consumed and were going to change their host's body. And thus the mutation started, veins grew darker and darker, they kept moving during their sleep, sweating as the parasite started to change their body. Yvan's belly was getting darker as David's back became darker. David woke up and went to the mirror and flexed multiple times up until he saw his darker back. David: What the ? He inspected it and wondered about it, he thought about going to a doctor but his thoughts were cut off by his libido. Same goes with Yvan who sees his darkened belly and gets cut off by his hunger, he went to his fridge and started to eat alot. Meanwhile David was jacking off like never before, he was surprised to see he could cum gallons of his cum and kept doing it over and over and over, soon his floor was becoming white because of the amount of cum coming out of him. Yvan looked at his belly, he would normally feel bad about gaining weight, especially since he had a big belly that looks like he swallowed a yoga ball but he felt… Proud, he liked it. Yvan's belly gurgled loudly and David's balls gurgled loudly, 2 tendrils came out of them. 2 came out of yvan's belly button and 2 from David's back. David:WHAT THE FUCK ?! Yvan:WHAT IS THAT ?! Both men felt a deep gurgle from inside of their body as they fell on the ground, David's cock pulsed, Yvan's belly pulsed, both became a deep black and their veins became the same black. Yvan's parasite: You cannot fight me, soon you and i will be perfect beings and we shall rule over these humans. Yvan's tendrils took every single food in the house, he moaned as the food went into his stomach, the tendril was feeding him. As for David, the tendril went inside his cock and pumped something inside as his balls grew larger. Yvan:What are you ?! Yvan's Parasite: I will be a part of you, I need you to become full, you will become the ultimate species on this planet. Your resistance is useless, you and i will be one and you cannot do anything about it so give in, be one with me and your hunger will be satisfied. He tried fighting but after an hour of groaning and getting fed by the tendrils, he gave up. David: What the fuck, what is happening to me ?! David's parasite:You wanted this didn't you ? You wanted to get sexier, stronger. And I will give you this gift, you will become the ultimate specie on this planet like it or not. David thought about it, was this thing making him stronger and sexier ? He grinned and he gave up all resistance. The two parasites started to go through the final phase of the two mens mutation. David groaned, his muscles growing, he started growing taller, 2 new set of abs appearing, forming a 10 pack, his balls took on a humongous size, spreading his legs and dragging on the ground when he stands up, his cock so big he could only jack off with two hand and it reached his pecs as he rose at almost 10 feet tall. Yvan meanwhile felt his cock and balls grow too but not at the same scale as David, he could feel something inside of his belly as it grew even fatter, hus ass also getting fatter, Yvan's belly started getting some stretch marks, a black liquid came out of his nipples like milk, a big black ball was inside of Yvan's belly and it was the same as the meteorite that both men saw. Their memories started to become fuzzy, only having one thought: Spread. Yvan's parasite: Your friend must also have gotten a similar treatment to you, go into the forest now Yvan:Y-Yes. David's parasite:Go to the forest and breed your friend David: Yes. David and Yvan both went to the place where it all started, the forest. Both men stood in front if each other, right beside the crater where the meteorite crashed, both men felt a deep need, like a hunger that needed to be satisfied. David:Yvan, grrr, I need to fuck ! Yvan:hngh ! Breed me now ! David immediatly pounced on him, fucking his fat ass. Yvan moaned as he got fucked with such strength that he started to cum wildly. David:MUST. SPREAD. Yvan:BLOW ME UP !!! Pre cul gushed out from David's cock as he felt climax approaching and his balls gurgled loudly, the two tendrils from David's back went into Yvan's nipples and pumped the milk inside which fueled David's libido even further and his muscles grew even more, his balls gurgled and got bigger as more cum was produced. David let out a loud roar as he reached climax, Yvan screamed as his belly got bigger and bigger. The cum was going inside the black ball, the ball seem to act like an egg that needed to be fertilized and David was overfertilizing it, it was growing uncontrollably, making Yvan's belly swell to ridiculous sizes. David kept roaring like a wild beast, and soon Yvan's belly started to loom over the town. Yvan: I'M GONNA BLOW UP Cum was getting into every part of his body, swelling his ass, his legs, his arms, his cheeks puffed. A crack started forming on his belly, the ball was hatching and it was the last straw. Yvan's belly exploded, releasing a black flood onto the town. The black flood had enough parasites to take over the entire town, each man in the town had a parasite enter their body, each one starting their mutation into a greater specie. Yvan's belly regenerated, still keeping that big belly he had. David:Look at all those people… Yvan: Soon they will be like us and we will rule over them. Both men were gone, the old Yvan and David now became a brand new creature and their reign was about to start.