Well, it's better than the worst that could've happened

Having stuffed Tina full of cum, you ordered the simulation to reinvigorate both of you. You turned off Tina's ability to feel pain and returned control of it to her.

"Damn," Tina said as she lay on her back on the bed, her four boobs quivering as the afterglow still shot through both of you. "Just... fucking damn. You gotta do that to me again some time."

"I think you can count on its being a regular occurrence," you replied, chuckling. Tina reached a hand over and stroked your still half-hard cock.

"Could 'regular' mean right now?" she asked. Her pussy was obviously ready to have your dick shoved in it once more.

"Right now I was thinking of something more practical, actually," you said. "It's not going to do to have you unable to move properly."

"I thought you said you didn't feel comfortable attempting to program in muscle memory."

"I don't," you affirmed. "But I can pull up all the code for the simulation so that we can see how the devs wired things to allow people with tails, or extra legs, or tentacles, or what have you, to control those. It should be easiest for someone like you, actually; they were probably able just to reassign the neural commands that would ordinarily control your legs into controlling your tail. In theory, it could be possible that all you have to do to move properly is think about walking. Your tail will respond automatically." Once again you flailed your tentacles as best you could. They moved feebly. "Entirely new parts will probably prove quite a bit tougher."

"Let's take a look, then," Tina said.

You gestured at Tina's terminal and the simulation's programming flashed across it. Responsive to your commands, it quickly narrowed down to two parts: controls for legs and controls for tails.

As you'd guessed, snake-like tails indeed just used unnecessary commands for leg movements.

"OK, so according to this, you should be able to generate a forward impetus by..." Thankfully the code was well-commented, even though it wasn't intended to be touched after the upload. Thank goodness for old habits dying hard, you supposed. After a lot of cross-referencing, you'd at least managed to get the theory of how Tina could move.

The practical application, however, was another matter. Even if it was essentially just commanding legs to move, the fact that the sensory feedback was not legs and feet but rather a tail made things very confusing for your friend. She paused randomly, fell flat on her chest more times than you cared to count, and seemed to move forward or backward almost at random chance--but only almost.

"It seems like you're getting the hang of it just a bit," you said encouragingly.

"Just a bit isn't going to do it when I'm trying to move through a crowd," Tina pointed out.

"Close your eyes and think about..." You go through the directions you'd deciphered from the programming again. Tina did a little better.

"Now that you're sure what impulse makes what movement, can't you just code me some muscle memory already?" she asked in mild exasperation.

"I'm not entirely sure, because, well..." You trailed off, not wanting to upset your friend further.

"Because I keep fucking it up? Is that what you were gonna say?"

"Not in so many words," you said defensively. "I can tap your senses, I know it's weird."

"Well since you can tap into my body, why don't you just take over and try this for yourself!" Tina harrumphed. "That or throw me on the bed again and fuck the frustration out of me. Whatever."

"Tempting offer." You focused and quite easily found yourself in control of both bodies, Tina reduced to a disembodied voice in your mind. "All right, I'll give it a try." You nonetheless took the opportunity to feel up your friend's body. "Might want to try having four tits of my own, though."

"Horny bitch," Tina muttered.

"Not for a few days, still gotta meet my family and all," you said placatingly, moving your new arms back down to the sides of the lamia body you currently occupied. "All right, I'll give this a try. If I can get this right enough the system should remember it and render muscles with the memory of proper movement when you're in control again."

"Just get on with it," Tina sighed.

You only did barely better than Tina.

"Not as easy as you thought it was gonna be, huh?" she said, her tone one of small triumph.

"Maybe I'm getting distracted having two bodies," you suggested from your own tentacled form, and forcibly de-rendered it.

"Could've put me in there," Tina pointed out.

"Later," you said, attempting to move your borrowed body again.

A lot of trial and error--and a triumphant laugh from Tina as you realized you'd been completely misinterpreting a vital section of the code--later, you finally had a modicum of consistent control over the tail's movement.

Going back to your own body, Tina resumed control of hers. Her movements were still a little worse than yours, but far better than they had been when you started. "I guess I can live with this for now," she said, slowly wriggling her way around the room--importantly staying upright.

"Now for the hard part," you said, already ordering the computers to pull up the section of the code for tentacles.

"I hope you meant harder part," Tina corrected.

"Talk back again and I'll give you my hardest part," you bantered back. That broke Tina down, especially with her feeling relieved about being able to move more normally.

"Ooh, is that a promise?" she asked.

You rolled your eyes and turned back to the code. "As I suspected, they had to write entirely new interfaces to make human brains work with extra parts when there wasn't any easy replacement. Well, here goes." You compared the code for tentacles to the code for arms, and attempted to think about doing the right thing.

Nothing.

"Not so easy now, is it?" Tina said, laughing triumphantly once more.

You gave her a withering glare. "I never said any of this would be easy." Checking the time, you add, "And it's only four hours until my family's uploaded."

"Can't you just manipulate the frame rate or whatever of this sim?"

"I could, but causing temporal dissonance while we're still in contact with ground stations strikes me as a good way of getting detected."

"How about just here in this room?" Tina suggested.

"Could, but I haven't really looked into what sorts of systems might detect a differential like that. Besides, low profile goddess here, remember?"

"But it'd be so much fun to pause the entire simulation and move around in it!" Tina said plaintively.

"Maybe if I ever get certain enough that I actually am the highest-level user here I'll try it."

"Seems to me like trying it would be a pretty effective way of knowing whether you're actually the highest-level user," Tina retorted.

"And if I'm not it'd be a pretty effective way of getting caught," you shot back. You focused on attempting to execute the command to move your upper-right tentacle forward. It made a tiny, pathetic motion in that direction before drooping back to hang straight down your side.

You turned to face Tina again to see her idly tweaking a nipple and fingering her cunt. Your tentacles twitched at the sight.

"It's almost as if they have minds of their own," Tina jibed.

Wheeling back around to the terminal, you realize you'd misinterpreted the code yet again.

"And that's why you leave the testing to the testers," Tina said. "I can't code for shit but I can figure out how a system works better'n you."

"Lucky guess," you groused.

"Was it? Autonomous action seems like it's not entirely unreasonable as a way of getting around the problem of creating new neural pathways. Now it's just a matter of showing those mini-minds who's boss in your body."

"I'm boss in this whole damn simulation," you shot back, in your irritation forgetting your caution about such statements. "But I want to figure this out the normal way, whatever normal means now, and save the cheating for later. I saw some plans in there for making those of us who went early and have these sorts of modifications teach the people who came later and had less time to figure it out."

"No allowance for those who skipped a few days to survey their new domain from on high?"

"Fuck you." Nonetheless, with the realization of the nature of how your tentacles operated, you approached the problem of controlling them as analogous to how a primary CPU controls secondary devices. You hadn't worked with hardware much, but the project had preserved the entire contents of the world's libraries, so you easily looked up some definitive resources on the matter. After that, it was a matter of thinking in the right way. It still took a while, but with about thirty minutes to go before your family was due to be uploaded, you had your tentacles moving mostly under your command.

Except when you took in Tina's building arousal.

"Damn it, did you have to get horny now?" you asked.

"Turn off my libido, then," she said.

"I don't exactly want to greet my family with a raging erection in my shorts," you pointed out in return.

Tina squirmed invitingly. "Maybe it's time to try a little temporal fuckery, then."

"Nah." You stood up and aimed your cock directly at Tina's overlarge rack. One thought later, you were spraying virtual splooge all over her even as she writhed in an exquisite climax of her own.

"You gotta do that to me again some time, too," she said.

"No time, gotta go," you said. You checked to make sure that the recording analysis algorithms wouldn't pick up on your not leaving Tina's apartment, put on your clothes with a thought, and "teleported" home.

--

As with Tina, you had a few moments between your parents and younger brothers--sisters, rather, now--being uploaded and their new bodies being placed in their house.

Unfortunately, their probable reactions to your new status were less positive than Tina's.

Sighing, you set out on another walk. It was impossible to feel tired in the simulation unless someone wanted to, so despite all your escapades with Tina you felt as fresh as ever as you made your way from the denser area where you lived to the more spread-out, suburban area where your family lived.

They'd had about an hour to adjust to their new lives when you rang the doorbell. Your father answered.

"Katey!" he said. Normally he'd open his arms for a hug, but it was clear that he was leery of doing so when his oldest daughter had four tentacles. Instead he just stuck out his hand and you took it.

"Hi, dear," your mom said as she sat on the couch, your father sitting down next to her. Your siblings were nowhere to be seen, though you could just faintly hear noises from upstairs, likely in the direction of their bedrooms. You didn't look into the simulation to check; you doubted they were having problems the way Tina had been. "Sam and Alex are upstairs. Greg and I thought we'd wait for you down here."

"Jane thought you'd be here within forty-five minutes of our upload time," Greg said. "So I guess you get to enjoy your mom's cooking tonight."

"Looking forward to it," you said. You didn't bring up that you'd had nothing to eat as yet, given that food wasn't a necessity in the simulation. You knew your parents wanted to try to carry on with life as usual.

"How are you finding, the, well," Jane said awkwardly.

"The tentacles?" You waved them around a bit. "Annoying to get used to them, but I figured it out."

"That's good," your dad said. "I think your bro--" He caught himself, but you could tell he couldn't quite bring himself to acknowledge what your sisters had chosen for themselves. "--siblings are still getting adjusted themselves."

"I think the simulation makes it easy to handle what they did," you said. "At least, knowing that it would be an option, knowing a lot of people would take it, I'd have made sure it was easy to adjust. I didn't find it too difficult."

Your parents looked uncomfortably at each other, clearly not liking the reminder that not only had their younger children undergone a full gender swap, their older daughter had given herself a dick substantially larger than her father's.

"Look, mom, dad," you said, leaning forward, elbows on knees. "This is life now. I know you want life to go on as normal, but there's nothing normal about all of us getting uploaded into a simulation. You chose to look about the way you did when I was born, and I respect that. Can't you respect what Sam, Alex and I have chosen? Trust me, when you start reconnecting with everyone, it won't just be us three who decided to take the opportunity to make more drastic changes."

Your mom took a deep breath, looked at your dad. "Katey, I'm sure we'll get used to it sooner or later. We won't have a choice! But you know we never read or watched anything like what this... new world is based on. So it'll take us a while, especially with all of our children having chosen dramatic changes. We don't look it any more, I know, but old folks like us don't do so well when you push us out of our comfort zone."

"I know, mom, but the upload was the one chance we had to make the change. If we'd gone as ourselves we'd be stuck as ourselves, and we all wanted to try something different."

"If it bugs you," a voice, with tantalizing hints of familiarity in it, said from behind you, "how about we go live with Katey for a while? If you're up for it, sis."

You craned your neck around to see what your parents were already staring at, and saw your younger sisters. The one on the left, whom your elevated access allowed you to tell was Sam, was wearing the last thing you'd expected: a low-cut black crushed-velvet dress that came down to mid-thigh and showed the entire expanse of her new, massive cleavage. Alex, meanwhile, was wearing a white, nearly transparent, midriff-baring tank top, showing plenty of cleavage herself along with her cut abs, and red booty shorts that were molded to her protruding ass and covered nothing of her thick thighs. It was a display clearly intended both to scandalize your parents and titillate you enough so that you'd all agree to have them stay at your place for a while. Maybe on an indefinite basis.

You weren't complaining.

"That, I think, well, um, I think," Greg stumbled over his words at the sight of his gorgeous twin daughters.

Jane glowered at her husband. "I think that would probably be a good idea," she said. "Maybe you three could go do... something together while I make dinner?" she suggested.

You hopped up. "We'll be out of your hair until you call us," you promised.

Making a shooing motion at the twins, you followed them up the stairs. Sam's dress was largely backless, held together only by a few tied laces; so was Alex's tank top, held on by only a single knot. You'd been practicing controlling your tentacles on the way over--you'd seen other people trying the same with the new body parts they'd given themselves--and while they weren't a great replacement for fingers, you figured you could probably untie a fabric knot with them.

Your cock formed a definite half-chub in your shorts.

"Did you two get rid of your birthmarks?" You didn't see the identifying splotches anywhere on your twin siblings' backs.

"No, we just moved them," Alex said, opening the door to her bedroom, closing it behind herself once you and Sam had entered.

"They're still the same shape, you'll be able to tell who is who later," Sam said, a lascivious note in her voice.

"How about you just tell me now so I'm not guessing," you half-lied.

"Fine, fine," Alex said, and with both twins facing you, Sam hiked up her dress while Alex peeled down her shorts. The shapes were the same, at least.

"Wouldn't have taken you for the type to wear dresses, Sam," you said as they covered up again, out of comfort rather than embarrassment. They still clearly wanted to fuck you when they had the chance.

"Maybe we switched shapes," Alex said. "Maybe I'm Sam."

You gave them your patented older-sister-is-not-amused-by-your-shit glare.

"Fine, fine, we didn't," Sam said, straightening her dress. "We knew this whole thing was going to be confusing enough for mom and dad, we decide to be women, you give yourself a cock and tentacles, so we weren't about to try to pretend to be each other."

"As fun as that used to be," Alex added.

"If you really wanted to fluster our parents without confusing them, you should've put them above your tits," you suggested, belatedly.

Sam shrugged. "We're not going to go about lying about who we are, Katey. We just wanted to have a little fun with you, that's all."

"Fine, fine. But in return I get to pick the games I whoop your cute asses at today."

Unlike your shared interest in anime--hell, you'd caught your siblings jacking off to some hentai that looked pretty damn similar to the stuff you liked on more than one occasion--your parents had been much more understanding and supportive of your enjoyment of video games, even joining in from time to time. Between you, you'd amassed a pretty substantial collection of titles and systems.

All of which was no longer relevant.

Not in a bad way, though. Efforts had been made to fully digitize as much media as could be found, but due to the difficulties of verifying who owned what when it came to physical copies, it was agreed that all media produced pre-upload would become freely available to all, with royalties for use paid out of a public fund. Entertainment products would still be made afterward, and sold normally, though relevant laws had been adjusted to account for humanity's effective immortality, but the upshot for now was that anyone could watch any TV show or movie, play any video game--at least among those that had been found and uploaded--for free, at any time.

Physical media still existed for those who enjoyed the experience of using it, but it was essentially meaningless. The discs held no data; they just represented a command to the massive data storage devices to provide the relevant media to the terminal requesting access. So even though the racks of disc cases and cartridges had been carefully reproduced in Alex's room--and your gaming room, and, you quickly checked, Sam's room--it was simply much more efficient to pull up the master list of games and filter to the one you wanted.

Controllers materialized when you input the number of players, and true to your word you were shortly outperforming them by your usual substantial margin.

After the first game, you started bantering again. "So do you actually want to come and live with me? I know they've lifted capacity limits and such but my apartment's still only meant for one person, and my spare room's my gaming den. I know renovations are free for the first few weeks but they're not starting those until everyone's been uploaded and they're sure the simulation's stable." Your tentacles, meanwhile, got to work on the knots holding up your sisters' clothes.

"It should be a lot easier to get a bigger bed than an extra room, as long as it fits in the apartment as-is," Alex suggested, that same lascivious note in her voice as had been in Sam's.

"Mmm, maybe, but my bed, my rules," you countered.

"How about we make a bet," Sam suggested. She lowered her voice to make sure your parents wouldn't overhear. "If you beat us next game, we'll come live with you and you can use us however you like. But if either of us beats you, you gotta do what we want in bed."

You considered for a moment as Alex nodded her agreement. "Make it a daily thing. I'm not having the rest of my sex life riding on one match." Or, more specifically, you admitted to yourself, you weren't interested in cheating at video games just to absolutely ensure that you wouldn't become your sisters' living dildo. Besides, it wasn't just your dick that was interested in getting close to those twin cunts. You subconsciously licked your lips at that thought.

You won anyway, despite Sam and Alex ganging up on you, more than they usually did anyway.

"One of these days we'll beat you," Alex said, not sounding at all disappointed that she'd lost.

"In your dreams," you said, and untied the knots.

Neither twin could suppress a small squeal of surprise as their nipples were suddenly exposed directly to the air, dropping their controllers into their laps as they reflexively reached for their clothes. You latched on with your tentacles first and kept them exposed.

"I'm going to be stuffing you both full of cum tonight; what does it matter that I'm seeing your tits now?" To make them feel more comfortable, you peeled off your own shirt and dropped your shorts. Your breasts, noticeably larger than theirs, bounced free, while your cock sprang almost upright, precum already beading at the tip. You held up a finger as both of them clearly wanted to get your shaft into a hole. "Time enough for dessert later," you admonished.

Another game later--you won again--and the smells from the kitchen had wafted up the stairs.

"Do you two have anything less risqué to wear?" you asked, going through Alex's wardrobe, which was all tight-fitting stuff that left her arms, legs, midriff and cleavage completely bare.

Sam and Alex looked at each other, and then you, uncomfortably. "No, not really. Mom and Dad had never seemed to look askance at these sorts of clothes before," Sam admitted.

"Even when you wore them," Alex put in.

"That was before all their children had tits bigger than their heads," you pointed out. "I get that you two want to look and feel sexy, because you're both hot as fuck. And I know that workplace dress codes are pretty well nonexistent now. But social norms are going to take longer to adjust, so you need some stuff that can get you through that."

"We, uh..." Sam began.

"Uh, we, kinda, well..." Alex tried to go on, clearly embarrassed.

You guessed what they were getting at. "You used up all your clothing selections on all this revealing stuff, didn't you."

Both twins flushed red.

You sighed. Thankfully your contractual benefits were pretty extensive, including a few familial ones. "Look, you know I worked on the project for a bit, I can make one outfit for each of my parents and siblings. I'll get you something respectable to wear."

Accessing Alex's terminal, you input your own identifier and pulled up the basic list of clothing you could order for your sisters. After a little back and forth, the new clothes appeared on the floor.

You'd insisted that they have one set of proper underwear--not just the skimpy lingerie you'd seen in the wardrobe--so you had to teach your sisters how to put on a bra. Not that you were all that experienced at it yourself, at least not when it came to wearing one with boobs as huge as yours were. You'd used one of your own remaining selections on a bra for yourself just in order to be able to demonstrate.

Their new panties were still sexy, but functional--nothing that was going to get wedged between their labia or in their ass cracks--and then it came time to put on the other clothes. Alex had the easier go of it, having chosen a pantsuit with a tank top that at least showed little cleavage, though it was effectively impossible to hide her outrageous curves. Sam, meanwhile, went for a skirt, blazer and blouse.

"Damn it," she said as she attempted to button her blouse, "why do these things work like this anyway?" Her left hand was clearly unable to get a button into a buttonhole.

"Long story," you said, gently lifting her hands away and doing it yourself. "You'll get the hang of it eventually."

"Easy for you to say, Miss Ambidextrous," Alex groused. Sam nodded her agreement.

"Every day I have to button your blouse for you is another day I get to stuff you full of cum, win or lose," you tell Sam, hefting her breasts quickly to ensure that they were snugly held by the bra. Support was no longer necessary, of course, but an ill-fitting bra would still lead to discomfort, though not pain.

"That wasn't the deal!" Sam objected.

"Same goes for your bras. You're gonna practice until you get it right." You looked down at both of them, your tentacles straightening their clothes. "My bed, my apartment, my rules. The bet'll be delayed." You smiled. "Unless you want to live here?"

That got them to acquiesce just as your mom's voice floated upstairs. "Dinner is ready!"

You quickly created a blouse and pants for yourself and put them on before heading downstairs after the twins.

Your parents were clearly relieved to see their children in less revealing outfits, though both of them were very obviously not looking at your crotch--no amount of slack in your pants would hide at least a partial outline of your dick, even as you'd **** it to be soft.

Dinner was a simple affair. It wasn't anything exciting, just big, thick garlic-butter steaks and piles of herb-roasted potatoes. Clearly your parents needed comfort food more than they needed something fancy for what would probably be their last full family dinner for a while.

They had, at least, taken to those aspects of computerization that allowed the cooking to be perfect regardless of how much time was taken. You felt a little guilty as you brought up the history of what they'd been doing while you and your sisters were playing games and getting dressed. As you suspected, it was mostly a long talk, the details of which you decided you could review later if you really felt the need.

"So we've been talking," your dad said, "and we think it would be better if Sam and Alex could live with you for a while, Katey."

"As long as you three are all OK with that," Jane added. "Do you have room in your apartment for them?"

Sam and Alex nodded their agreement at the proposed arrangement, and you said, "I can make space for the time being, and I'll put in for a renovation edit to get an extra room or two once those start being processed."

Both of your parents had looks on their faces that made it clear they expected you to add at least two rooms.

"We still want you to visit," Greg clarified. "We don't want to lose touch. We just, well, we need time to adjust. And space."

"We know," Sam said. "Don't worry. We'll be fine together."

"And we'll visit," Alex promised. "Can't get tired walking here, after all."

"You're always welcome to drop by, too," you added.

With that, you all got up from the table. The dishes and cutlery were self-cleaning, as were the pans and baking sheets, so there was no cleanup necessary. Your mom touched a button on the kitchen wall panel and everything was back in its cupboards.

"See you soon!" you called as your dad closed the door behind his children.