Gwen Stacy was swinging through the city. Patroling the streets at night to make sure that the city was safe. Having decided to check out Earth-616, Gwen was taking some lessons in crime fighting from Jessica Drew, this universe's Spider-Woman. She was happy to have a mentor in this strange world. Then out of the corner of her eye, she was something slither into an alleyway. Swinging over and lowering herself onto the roof, Gwen checked it out.
"Alright, who's there?" she said. But there was no responce. She jumped down into the alleyway, and began to look around. "I saw you come back here. I know your here, now show yourself!" she demanded. Suddnly she heard a clatter from some nearby garbage cans. She turned to her back and ran over to investigate. But she found nothing. However as she turned she saw a blob of good grow in size and attatch itself to her, forming a cacoon around her body.
(Inside Gwen's Mind)
"Ahhhh. Misssss Stacy.....yessss. You will make an excellent hosssst."
"Your Venom! Aren't you!" Gwen said. "Let me go!"
"I can senssssse it. You want Peter's love." the symbiote hissed. "Maybe therrre is a way we can both get what we want"
"I am not going to be your host! Let me go!" Gwen demanded.
"I don't think ssssso." it hissed. Slidding a tendril into Gwen's cunt, causing her to let out a moan. "That feelsssss good, don't it. Just imagine it....Peter grovaling at your feet.
"No! G........get out of my head." Gwen said as she tried to fight it off, as another tendril entered her ass.
"Admit it, you want Peter'sssss love, just as I do! With my help you can have not jussst his love, but the world!"
Gwen, weak from the arrousal couldn't help but imagining it. Herself sitting on a golden throne, Peter and other stud-like heroes at her feet as her fellow superheroines were also covered in symbiotes, all willing to help their 'mother'. Gwen began to drool at the thought of it, before shaking her head. "NO! You are n....not going to turn me to the side of evil!"
"Evil? No, Peter himself killed your counterpart in this world remember, he should be you ssslave to make up for it."
"He didn't mean to do it!" Gwen shouted, still weak from the arousal the symbiote was causing. "He was trying to save my counterpart."
"Ssssso what? He still killed this world's Gwen Ssssstacy. He should be your ssssslave! Besides, you think he really cares about you? He was quick to get married to that Mary Jane after you were gone!"
Gwen scowled at the mention of that name. She remembered how poorly her world's Mary Jane, or rather Em Jay treated her. Using her to further her own carrer. Something the symbiote quickly picked up on.
"Ssssso. You do have sssssome pent up rage. Yesssss. Focussss on that......" the symbiote suggested to her, Gwen's mind starting to become suggestable to the symbiote's words after the arousal. She remembered each and everytime Em Jay had treated her like shit. From trying to constantly manipulating her into rejoining the band, to insulting her, to even being such a vain bitch who thought of Gwen as just a tool.
"Thisss world has a Mary Jane. She is Peter's wife. I may have a sssssolution."
Curious, wen raised an eyebrow. "What is it?"
"Asssss I sssaid, we could sssspread new symbiotes. With usssss working assss one, we can even control our new offspring. Think about it, giving Mary Jane a symbiote, causing her to become a loyal daughter to you! She will happily steal, fight, and fuck at your command."
Gwen got wet at the idea. She knew it was wrong, but her hatred for Mary Jane made the symbiote able to drasticly increase her darker ambitions. She didn't care anymore. She didn't care if it meant a life of villainy. Gwen would make Mary Jane pay, and make Peter love her. "Alright Venom! From now on we are one." Gwen said.
"Excccccellent!" said the symbiote. "From now on we are now one!"
(Back in reality)
The symbiote cacoon around Gwen began to morph into a suit, and under that suit her body began to morph. Her arms and legs gained a notible amount of muscle, making her look quite a bit on-par with She-Hulk. Her boobs grew to massive E-cups, and she grew to 8 feet tall. The symbiote formed massive talons hands and feet, and soon covered her face with it's slime-like embrace. A demonic face formed, with a large gaping mouth, as a long vemon-dripping tounge hung from it. A white Spider-like logo crossed her breasts, as the symbiote left her short blonde bob-cut on full display.
"Yessss. We are no longer Gwen Stacy, Spider-Woman, or even Venom. Frrrrom now on, we are Gwenom!" the newly minted villainess said with a cackle