An erotic fantasy simulation

"This one," Isabel said, pulling up a window to her chosen sub-simulation so that the three of you could look into it. "Lustaroc."

"It certainly lives up to its billing," Tina said, giggling.

The basic concept of the chosen sub-simulation was pretty much a standard fantasy world that would probably be the setting for some sort of role-playing game campaign. Swords, spears, bows and the like were the order of the day for armed combat, and, of course, there was magic. That was, you had no doubt, part of what had drawn Isabel to a simulation like it: the fact that she could use her control over the computers to do as she pleased and just be able to write it off as powerful magic. More powerful than even the villains of the "world" could use, even those that were computer-generated rather than played by people who wanted to be evil in the setting, but nobody in there knew the actual limits of their "magic", so anything you and Isabel did could be passed off as having been the product of long, arduous training and research.

The other part of the appeal was the fact that, as its name seemed to suggest, it was one of the most erotic sub-simulations, having been coded in a way that, for instance, immodest dress made people better able to avoid and withstand attacks. Those attacks, meanwhile, would sometimes come in the form of a spray of milk or a blast of cum, mages often preferring those to more mundane methods like a gout of fire or a spear of ice. Futas like yourself were rare, but not unheard-of, and were generally among the most powerful users of magic in the realm.

All things considered, you had no complaints about Isabel's choice.

"So what are we going to wear, then?" you asked her.

Isabel snapped her fingers, and immediately you felt clothes on your body. Creating a mirror, you took in what she'd done.

The clothes, as you could tell from the feel, were leather. You were dressed similarly, with a quarter-cup bra, bracers, a belt with hip pouches and shoulder straps between your tits, and greaves. For weapons you had a crossbow and sword on your back, a staff as long as you were tall in your hand, and a quiver at your hip. Of course, those were mostly just for show, as the characters Isabel had inserted into the simulation for you two to "play" were, secretly, high-level mages with access to magic that far exceeded anyone else there, and it was clear that she intended that magic to be channeled through the boobs, pussies and dick she'd left on full display.

"Care to choose where we enter?" Isabel invited.

Because of the nature of the simulation, it wasn't too uncommon for people to appear and disappear in the field. Most players tried to get back to one of the designated safe haven cities if they could, but sometimes someone had to leave and didn't have the chance. When they came back, they'd respawn wherever they'd left, albeit with a small grace period to make sure that, in case it happened to be in the middle of an active battle, they wouldn't just get chopped down immediately.

You gestured at the "window". "How about here?" you said, showing a point not too far from where a pair of warriors were pinned down behind a boulder by a computer-controlled fire mage. "I'm sure they'll be extremely grateful."

"And I'm sure your dick will be extremely grateful to get into their cunts," Tina jibed.

"I'm sure that was a complete coincidence," Isabel said, an innocent tone in her voice.

Truth be told, you wouldn't have minded terribly just waking up in a boarding house in one of the safe havens, but when you'd scanned the simulation and found the two athletic, curvy beauties you were focused on, you couldn't help but choose to rescue them first off.

You made your fingertips crackle with some sort of energy. "Don't make me turn you both into newts or something."

"I'm sure I'd get better eventually," Tina said, laughing and waving you toward the simulation.

One confused look from Isabel later and the two of you had jumped into Lustaroc, speeding up its processing so that you could spend what felt like years if you wanted to and still come back with only an imperceptible amount of time having elapsed in the "real" world.

--

You appeared some distance behind and to the side of the wizard, waiting a little for the enforced noninteractivity to wear off. There were certain things even high-level reality warpers such as you and Isabel weren't supposed to be able to do, after all.

Nothing much had changed in that time, though, the warriors being unwilling to break cover and the mage being unwilling to waste magic, so grabbing hold of a nipple, you squeezed it as you shouted, "Lacta!"

As you'd intended, a powerful stream of milk blasted from the teat, scything through the air to impact the pyromancer square in the head, annihilating it and leaving his corpse to slump lifeless to the ground.

Isabel came running up behind you. "Hey!" she called. "Should be safe now."

"Who are you?" one of the warriors called back.

"We just saved your lives," you pointed out.

The two conversed among themselves for a moment. "I'm Kiera, and my friend is Mona. We're from Isifeld," the same voice said.

"I'm Katelyn," you replied in turn, "and I'm with my friend Isabel. We're from Grindalk." In Lustaroc, one of the oldest alliances was that between the Kingdom of Isifeld and the Duchy of Grindalk; citizens of the two realms treated each other like fellow countrymen.

"You're a powerful mage," the other warrior, Mona, said; you could tell that she'd just seen the milk running past in a rivulet.

"We both are," Isabel said. "We're also somewhat proficient with sword and bow, but we would really appreciate the companionship of a pair of seasoned fighters such as yourselves."

"You've heard of us?" Kiera asked.

Kiera and Mona, you knew, hadn't done too much of note, but there were still a few things you could mention. "We helped a farmer restore his fields the other day after they'd been ravaged by a small wyrm. He told us you drove it off, and we decided that we wanted to meet you. It's not just anyone who can fight off a wyrm without a mage around, after all."

Finally the pair stepped out from hiding. Like you and Isabel, they were scantily clad and wonderfully busty, though their armour covered a little more than yours did, and they were wearing thongs wedged inside their labia and between their titanic ass cheeks. Neither, as you'd known coming in, had a dick.

"Honestly, we got lucky," Mona admitted. "We really did need a mage along to tackle that thing properly. One of Kiera's strikes happened to slip between its scales and the thing slunk off to lick its wounds. That farmer's going to be dealing with it again in a few days' time, I think."

Isabel knelt down next to the largest puddle of your milk and waved a hand over it. The surface turned clear, then resolved into an aerial view of the land around the beleaguered farm. "Looks like the wyrm's lair is here," she said, gesturing to a mountainside cave. "I don't think it's moved from there for a while, so it might leave at any time. Still, we're only a few hours' march away from it, so it shouldn't be able to get that far even if it does leave, and Katelyn has a talent for spotting things at long distances, so we should be able to track it in any event."

Kiera and Mona looked at each other, then nodded. "All right, let's take this thing down," Kiera said. "Just one thing, though."

"Yes?" you asked.

"You let me deliver the killing blow. I've got a score to settle with that thing." Kiera turned around, and you could see a nasty, hastily-treated wound across her upper back.

"I can heal that, if you like," you said.

"I'll be glad of it, once we've disposed of the beast who gave it to me. Caught me with one last swipe of its tail as it left. Cowardly bastard."

"At least let me treat it further," Isabel said. "If it gets infected you'll have much more immediate problems and we'll be down a warrior who needs her ****." Unlike the main simulation, certain sub-simulations allowed for things like disease. Lustaroc especially was not bound by almost any of the rules of the regular world, but people who died in it could just create a new character for themselves and keep playing.

Kiera nodded and sat down on the rock she'd been hiding behind. Isabel produced antiseptic from her hip pouch--this sub-simulation gave everyone some sort of bigger-on-the-inside space in which to store such items; you supposed putting it in the cleavage might have been a bit impractical for rapid access--and cleaned the wound.

"Shall I just bandage it for now, or do you want me to stitch it up?" she asked.

"Just a bandage," Kiera said. "We'll make short work of that wyrm and then I'll take your friend up on her offer of healing." Isabel nodded, took out a bandage and applied it carefully, using a bit of her pussy juice to seal it to Kiera's skin.

"That'll hold for a while," she said. "The antiseptic also anaesthetised the wound, so you shouldn't feel much pain from it at least."

Kiera smiled, then said, "All right, ready to head out? We've got a wyrm to hunt."

--

On the march toward the farmland, the conversation soon turned to personal stories.

You gave an anodyne version of yours--nothing special, just a computer programmer who'd been invited to try out some sort of live-action role-playing but had only expected it to be some sort of small thing, not a whole sprawling world. You'd dragged Isabel along with you, since she was all on her own after her family had refused uploading. Ever since you'd first come here, you'd both been hooked, which would serve to explain your powerful magical abilities. Still, you'd spent most of that time cooped up in a private apprenticeship with Master Galan, an aged dwarf who was regarded as the greatest magician in Isifeld or Grindalk, and had only recently set out into the world.

"Kiera and I were grad students when the news broke," Mona said. "In biology, of all things. Like that's going to be all that useful up here." She snorted. "But we'd always been avid roleplayers, and we each got a message not long before the upload inviting us to participate in some sort of virtual world like the ones we set our campaigns in."

"I know what you're thinking," Kiera said, "why would we just believe some random message that we got? But the way we saw it, that asteroid would kill us anyway. If we just went to the main sim, we'd have to find a whole new thing to do. So worst case scenario, we take the offer and it's a hoax and we either end up dead or leading boring lives in humanity's brave new world."

"Best case scenario, we end up in an awesome place like this with rocking bodies, kicking ass, taking names and fucking as we please," Mona said, deliberately altering her walk to show off her prodigious curves.

You nodded. Permanent denizens. Most of the non-AI--to the extent that meant anything any more--inhabitants of Lustaroc were people who had day jobs in the "real" world and came here after hours. A relative few were here for good, and, better yet for people like Kiera and Mona, Lustaroc wasn't a place that'd kick you out if you died. Some sims were like that, the permanent residents reverted to part-timers (or were excluded entirely) if they ever died, but here these two could just keep making new characters if they wanted to.

"How often have you died?" Isabel asked.

Kiera and Mona looked at each other and shrugged, each seeming a bit sheepish. "Never, but that's mostly just because we've kept our heads down and haven't tried to do anything that heroic," Kiera explained.

"We've mostly spent our time contracted with the Isifeldian Royal Guard," Mona said further. "So you can imagine how much action we'd seen by the time we took a leave of absence and decided to see the world a bit."

Both you and Isabel chuckled. Isifeld and Grindalk both had been at peace for a very long time, their long-standing alliance making them too powerful a foe for any enemy to consider attacking. There were still occasional border skirmishes, but those were only with small mercenary raiding groups, not anyone affiliated with one of the other countries in Lustaroc. Even so, nature itself posed its own threats, and these farmers had the misfortune of being just a little too far outside the area that Isifeld normally patrolled around its borders. Living free on your own land was certainly an experience plenty of people wanted to have, but it wasn't without its own dangers.

"So what's your story?" Mona asked. "Why'd you choose to be here? Beyond the basics, anyway."

You put the more detailed story you'd cooked up into Isabel's mind-chip so that she would be able to play along. Of course, nobody would ever be able to disprove your story, since you could alter the preserved historical record so that what you came up with would be true so far as anyone else knew.

"We sort of didn't," you said. True enough, at least so far as the initial upload went. "The guy who made this sub-simulation privately snuck in a few hacks for himself, giving him essentially godlike power within it." Isabel transmitted her amusement into your mind-chip. "But there was a mix-up during the upload, and so I ended up here with the hack he had made for himself, and he ended up in the main sim. As for why we chose to come here, yeah, programmers are still in high demand in the main sim, but I just wanted to relax doing something else after working hard on getting this place up and running, y'know?"

"Somehow I got caught up in the glitch, as well," Isabel added.

"So... you're both God here or something?"

"Or something," Isabel said. "Katey's basically God, I can do everything she can do except not to her, she can do it to me though." You theatrically waved a hand at Isabel and her hair grew down to her ankles. When she did the same, nothing happened to you, just as you'd both intended.

"Hunh," Kiera said. "Some part of me thinks I should be pretty disturbed by this, but I'm not."

"That was part of the hack," you explained. "The guy didn't want people getting all freaked out by what he did, at least in some contexts. He basically just wanted a role-playing world where he could fuck anyone he wanted and they'd happily go along with it. Also why everyone who got invited was a hot chick, though the generated personalities that populate the world vary."

"But he still wanted the role-playing aspect of it," Isabel added, "which is why if Katey suggested that she might just delete that wyrm, you would get annoyed."

Kiera thought for a moment. "Yeah, don't you dare fuck with that wyrm, it's mine. But if you wanna fuck me, that's cool."

Mona nodded in agreement. "Actually, could you maybe demonstrate a little? Feels kinda exciting to be traveling with God."

"That was another part of the hack," you said. "You're not just OK with me using my powers for sex, you actively want it." Isabel's amusement fluttered across your mind-chip again; that hadn't actually been part of your idea, but Mona's mentality was one that you'd immediately added to everyone in the sub-sim.

Kiera nodded. "We got time to kill on the walk, I'd rather spend it being fucked with than talking."

"Well, if you insist," you said. You snapped your fingers for effect and instantly the four of you were naked, your cock hard, all of your nipples fully erect.

Isabel didn't often give herself a dick, but she gave herself two, and without further hesitation caused Kiera's mind-chip to be linked to a projection that had her twin cocks shoved into pussy and ass, deleting the old one. The warrior moaned in pleasure both at the sensation of being screwed in two holes at once, and at how easily her very being could be manipulated.

Meanwhile, you made your tentacles shoot out and grab Mona by her boobs and waist, lifting her and impaling her cunt on your own shaft. "Want your ass fucked, too?" you asked.

Mona nodded as she also moaned in mounting ecstasy.

"Well, I like them bigger than yours," you said, mostly just as an excuse to cause the simulation to render the other woman with a much fatter rump, giving her what could only be described as a pear shape despite her bustiness, and it was only then that you grew a second dick for yourself and snaked it between her titanic cheeks to penetrate her anus.

"Though really, an ass this big deserves more than one dick, don't you think?" With those words, you **** a second thick shaft through Mona's rear, enjoying the pleasure of two cocks rubbing against each other as they both **** their way into Mona's too-small asshole.

Meanwhile, Isabel was playing with Kiera's ample chest. "It's worth adding that the guy who made the hack did prioritise the sexual aspects over the role-playing aspects, though," she explained. "You'd get mad at us if we just killed the wyrm, or somehow prevented you from doing it, unless it was because of sex stuff." As you continued to walk, the two "locals" bouncing on all your cocks, Isabel made Kiera's breasts grow, and grow, and grow, until each was much larger than the rest of her.

"It's kinda hard to fight with a chest like that," you said, neither Kiera nor Mona able to form a coherent thought because their mind-chips were dedicating most of their processing power to simulating sexual pleasure, "but you're not mad about it or anything, yeah?"

Isabel slowed the pace at which she was fucking Kiera so the woman could respond. "I'm not," she agreed. "I guess you're right; if it's a sex thing I really don't care."

"Don't worry, we'll put you back to normal when we find the wyrm," Isabel promised. Kiera just shrugged; letting herself be used sexually by the two of you was more important to her.

You let out a grunt of your own as you blasted three loads into Mona and kept going as she reached orgasm after orgasm from how sensitive you made her. The absence of refractory periods had been something most people had adjusted to pretty quickly, and generally considered one of the best parts of the simulation even by those who didn't like that they were living in a hentai--after all, even those, like your parents, who remained faithfully monogamous and had made only minimal changes to their bodies still had enhanced libidos and fucked plenty.

It took a little while longer for you to get near to where the wyrm was. As you'd walked, you and Isabel had kept making Kiera and Mona ever more outlandishly proportioned, the rendering servers processing geometry in new and exciting ways so that you could keep fucking even as the two became massive boobs and asses with a body stuck in between. But as you'd promised you restored them to normal once it was time to fight.

Well, mostly to normal. Their bodies didn't get in the way of fighting, but you and Isabel had left them with substantially curvier and more muscular bodies, four torso-dominating breasts each, gigantic butts, six arms, hair to their ankles and **** sexual sensitivity.

You'd also merged their appearances and altered all relevant records so that, as far as anyone aside from Isabel and yourself knew, they were identical twin sisters with **** fetishes.

"Mind softening it up a little?" Kiera asked as the four of you took in the wyrm, resting in its lair. Mona was stringing her three bows. "I'm not looking to do this in any sort of heroic way, just want to slash it to pieces and get out." She wielded a variety of blades in her six hands.

You nodded. Mona dipped a trio of arrows in what you knew was a strong sedative and relaxant, then nocked them, aimed, pulled back on her bowstrings and fired.

You and Isabel had kept your twin dicks for the time being, and the T'nin woman teleported to the other side of the long creature. She gave herself a second pair of arms while you used your tentacles to stimulate your nipples and dicks, and soon enough milk and cum jetted out, coating the wyrm, softening its scales so that Kiera's blades would have no problem penetrating and slashing it to ribbons.

Which the woman proceeded to do, wasting no time in taking her **** before running back to her sister and having a celebratory kiss and mutual finger-bang.

"Hey, we helped too, y'know," Isabel said, chuckling.

"Then hurry up and fuck us some more if you want," Mona said, briefly breaking the kiss.

You shared a smirk with Isabel before letting her derender the four of you and place you in a comfortable suite in one of the better inns in Grindalk's capital, getting rid of Kiera's wound in the process.