No Space Left Empty (Spiderman/Spidergwen)

If she were to be truly, completely and unquestionably honest, Gwen would have to admit that she frequently had absolutely no idea what ws going on. In fact, sometimes, she wasn't even sure if she knew who she even was.

And while she could tell you an extensive list of reasons why at any given time, some of which had to do with interdimensional travel, nigh-omnipotent beings and most importantly, the whims and wills of unpleasable monsters from beyond, none of it would change the fact that she was currently dealing with a really, really big problem.

Namely, she had a symbiote costume that was starting to get increasingly more obstinate about space issues. Now, most people didn't have to deal with the problems she did. Symbiotes were pretty efficient about space and storing themselves in ways where they wouldn't be a bother. Hell, she had known some to straight up simply act as their partner's wardrobe in general, removing the need for them to wear any other sort of clothing.

Gwen was not so lucky.

She wasn't sure why, exactly, the symbiote had turned out the way it had, but a combination of factors had led to the situation at hand.

That situation being?

Gwen was now walking the streets of Manhattan, doing something as simple as going to the store, but she wasn't doing that alone. Her clingy other half, whom she was connected to at the genetic level, refused to just take the form of a nice hoodie and warm pants to combat the chill of the winter winds, and instead, she found herself having to dress up with warm, thick and heavy clothing just to go out, because going to the store dressed as a super hero was a recipe for disaster.

Especially in a place that had an irrational hatred of all spider themed superheroes.

And so she bundled up, even threw a scarf around her neck and lower face, and a white beanie with a pink pompom on top that she didn't even remember owning, and went out.

Not a moment too soon, she started to feel her partner stir.

Now, what was the big problem with her partner?

Well, as stated before, it was very... particular of accomodations. Her symbiote didn't just... make itself small, or take over her clothes, or anything so simple, no, not in the least. Her symbiote instead made itself at home in the only place it, apparently, could survive in for long periods of time due to the dependency on her it had at a DNA level.

And that place was the inside of Gwen's own body.

Which would not have been an issue if it hadn't decided to stir and start expanding as soon as Gwen made it one block from her home. She really should've taken some sort of transportation, use any of the myriad phone apps that offered rides, but nooo, she had to be health and environment conscious and decide she could just walk to the store that sold the specific brand she wanted, which happened to be several blocks away.

The first block was fine, as her partner simply moved about a little.

As soon as she crossed the street things became more problematic, however, because the expansion rate of her partner was increasing. Another of the particularities of her symbiote was that it seemed to prefer being spread as much as possible.

And that meant that Gwen's body, which was normally pretty used to holding the symbiote within, started feeling the pressure, and more importantly, the usually almost imperceptible sensations of the symbiote's body within her started to become harder and harder to ignore with every step Gwen took.

Were one to look within with some sort of super X-ray vision, they'd be able to see that the insides of Gwen's body almost had a second circulatory system that ran through her, reaching almost every part of her body, they would've been able to see it was a variety of colors but mostly black, white and pink, ever shifting, moving around within her.

They would've been able to see that certain parts of her body housed more of the symbiote strands.

And more importantly, that those certain parts of her body were slowly starting to be taken over by the ever expanding root-like veins all over her body.

Gwen herself could feel it in her own flesh, and she couldn't help but let out a sigh and a half hearted cry of exasperation. There was nothing to it. Her symbiote was trying to relax, and that meant it was expanding within her body, to the places it could. She winced as she felt her throat being one of the first things that was filled up. She didn't need to breathe, one of the advantages of the symbiote was that it could actually filter oxygen and feed it into her lungs with extreme efficiency, much better than her respiratory system, but it was still uncomfortable to feel her airways getting filled with the incredibly viscous fluid-like body of the symbiote, and she knew that she'd need to be careful about not letting anyone see under the scarf, as the symbiote was covering the inside of her mouth and thus if she opened it, only a black void would be seen.

As Gwen made it past a familiar restaurant she'd eaten a few times at and responded to a call and greeting from the asian man that ran the restaurant of dubious procedence, she felt a tingle run across her body as more of the symbiote started spreading and growing and expanding.

She winced and almost stumbled, but was able to recover and point at the ground, at a loose rock that she hadn't actually touched, and blame it for her stumble when the proprietor of the store called out for her and asked if she needed help, or at least it looked like he did, he spoke extremely accented English that was hard to understand at the best of times.

Gwen's cheeks were lighting up, hot and pink already, as she waved her hand and walked away, pretending to adjust her coat as she did so. What she had felt was the start of the symbiote expanding deeper into places that she wouldn't want most people to know her symbiote went into... specifically, she felt the symbiote begin to expand and fill her asshole.

There were places it wouldn't go, most of them were part of her digestive system, but it absolutely had no objections about invading her ass, starting from the anus and slowly but implacably forcing its way into her at first tightly sealed ass. Gwen considered herself adventurous and open minded, but she still hadn't really used her butthole for anything other than its intended purpose...

At least, until she got the Symbiote that she was wearing, which seemed to delight in showing her things not just about the world, but about herself, because she felt a quite interesting pleasure and a matching feeling of being stuffed and uncomfortable.

She took a step and her breath caught in her mouth as the symbiote's probing tentacle of viscous slime became bigger and harder, growing and changing shape to accomodate entry into her anus, further pushing into her. She was certain it was even invading her intestines little by little, and though it was extremely uncomfortable and even slightly painful at first, as she walked, as she felt everyone around her and tried to make sure nobody could tell anything was happening, so that no one may look... And yet, even though she intellectually knew no one was looking, it felt like everyone's gazes were burning into her.

She hated the fact that she was a little bit excited by that.

She hated the fact that it was turning the experience of being stuffed like that, of feeling a slowly expanding mass in her anal cavity in the middle of a somewhat busy street, and thinking about how exciting it was and wondering if anyone could tell that she had something up her ass.

Gwen wasn't one to frivolously use the word degenerate, but it certainly felt like she might well be one.

Every step she took was actually just making her feel the mass in her ass more intensely, every motion she made, the swing of her hips as she naturally had to twist them with every step. Never before had she hated her hips so, the body that evolution had saddled her with, than when their natural gait made her so keenly aware of the fact that the symbiote chunk in her ass had by now grown to the size of her closed fist and only seemed to be getting bigger, only seemed ever more dedicated to filling the entirety of her asshole and then expanding beyond its capacity.

And as if to make matters worse, she could feel something else.

She turned around a corner, and almost crashed into someone, so distracted that she couldn't even pay attention to any one of her senses, mundane or otherwise, because she was starting to notice the funny and slightly itchy feeling of symbiote matter crawling across the by now wet walls of her pussy.

Symbiotes, she understood, fed upon human emotions, but they could take in and break down almost any organic matter, and even certain kinds of metals. They didn't get any nutrition from it, but they certainly could, for lack of a better term, consume it... and for some reason, Gwen had a feeling that her symbiote was thrilled at the fact that it could.

She was getting wet, and this only seemed to further encourage the symbiote to invade her pussy.

Wincing, the blonde superheroine began to walk faster, trying to get her errand done with as soon as possible, because she didn't know if she could stand to be outside even as her symbiote was practically penetrating her in the most sensuous way it could, with the biggest, widest dick she had ever imagined, let alone felt... not because of the embarrassment alone, though that was by no means a small factor.

No, it was the fact that she was starting to discover that she might very well enjoy being stuffed in public.

The symbiote in her ass continued to grow, filling more and more of her bowels, and already it was starting to make it difficult to walk, her motions became awkward, and not even all of her enhanced agility, dexterity and strength could keep her walking perfectly straight.

Her body was heating up so much that even though the winter cold was harsh, she was actually starting to sweat because of it. Because of her symbiote. Because it was even starting to fill up her pussy as well, the strands that were covering her walls rapidly becoming a flood. It was expanding faster and faster. Her throat was covered, it was like she had swallowed something huge that wouldn't quite go down, like she was giving the deepest deepthroat imaginable, to the biggest, widest, most huge and hard yet flexible cylinder.

For a moment she briefly thought of the humorous image of swallowing a pool noodle, it really did describe the sensation.

But the mass in her ass wasn't even like that, it wasn't like that at all, it was like a knotted, warty, bumpy and ribbed deformed monstrosity, it was filling her ass utterly and completely and stretching her just a tad beyond capacity, and it forced her to stumble into one of the city's many dark alleys.

It had a light stink, mostly alcohol but also trash and urine, but she could hardly pay attention to that, stumbling into the alley and placing a hand on the wall, the smell wasn't hitting her because the symbiote had even invaded her nostrils and was filtering the air she breathed in entirely.

The moment she was out of view from outside she felt the mass in her pussy suddenly grow extremely fast, rapidly matching and then exceeding the size of the mass in her ass, she scratched her previous thoughts, the mass in her mouth might as well be a hotdog, THAT felt like getting a pool noodle shoved inside her pussy, she was sure it had at least that width and thickness, and it certainly felt like it had the length!

She knew women were stretchy down there, children went through that hole after all, but she didn't think bodies were supposed to have somoething that size shoved INTO them!

She closed her eyes and screwewd up her face, breathing hard, fast and in short pants, stumbling a little further and then planting both hands on the wall, as the symbiote worked its way into her, growing more and more, and eventually going into where it wasn't supposed to, where nothing was supposed to go.

But of course her companion, her partner, the other half born of her DNA itself, went ahead and went through her cervix, invading into her womb and then rapidly filling it, completely and utterly, forcing her through its manipulations of her body to expand and stretch, and her belly with it as well. Gwen grit her teeth, this was not supposed to feel good, this should've been horrifyingly painful, and yet there she was, getting stretched so much her shirt threatened to give up and explode, and her hoodie was barely holding onto its shape, the threads stretched to their limit.

She panted and tried not to let her voice out, her fingers carving lines into the brickwork of the wall she was leaning against, tears leaking from her eyes from the effort she was putting into not letting anything show from the sensations that were taking her over.

And then little by little she came down to earth.

She was full, she felt stuffed beyond belief.

She wasn't just full of food, or pregnant, but she certainly looked like she'd been binge eating for days and was carrying a nine month pregnancy on top.

She breathed heavily, one hand on the wall, the other on what looked like the belly of a woman so pregnant she was about to explode.

She asked herself if her favorite brand of nachos was worth the effort of walking all the way there with what felt like a misshapen ball in her ass, a horsecock down her throat, a pool noodle up her cunt and a beachball in her womb.

She closed her eyes and steadied her focus.

Of course they were. She wanted to watch a movie and eat nachos while relaxing.

"Alright then," she whispered to herself, and then pushed off of the wall, and began to waddle, as best as she could, towards the mouth of the alley.

Every step she took made all the massive amount of symbiote inside her feel like it was sloshing within her womb, vibrating in her ass, throuth and pussy, and most important of all, like it was fucking laughing at her as she did.

But she was not going to have her day ruined.

She thought, once more, about the insanity that was her life. About visiting different worlds. Meeting gods.

She thought about other versions of herself, as well.

"Bet the other mes don't have to deal with this bullshit," she hissed, rubbing her belly and trying to ignore the fact that rather than closer to the store, every step took her inexorably closer to the impending orgasm that was coming for her. She envied a lot of her alternate selves. Then as she walked, she thought of something. "Except the one that had children with Norman Osborn. Don't know what the hell she was thinking," she muttered to herself as she walked.

Not for the first time, she thought about how different her life could've been, because she had literally seen it, and wondered if she'd have been better off never learning about the many alternate Earths out there, as she desperately tried not to cum on her way to the promised nachos.

However, as the pleasure rose with every step she took, she was forced to admit...

She was definitely much better off than some of the other Spiderpeople she'd met...