The anniversary gift

You sat at the table in the apartment you'd long since given to Sam, Alex and Drew, just the four of you celebrating the fiftieth anniversary of their wedding.

"Thank fuck for compression clothing," Alex said, cupping her upper breasts, all four currently supported by compression shelf bras that shrank them to a size that was more or less what she had upon entering the simulation over half a century prior but left her nipples fully visible. "Don't get me wrong, I love having four breasts bigger than the rest of me, the permanent lactation is great too, and that we can move normally here is useful, but sometimes you just want something smaller, you know?"

"And the recent changes to the sim to allow for people with bodies like ours to teleport between adjacent adult spaces and have stuff move out of the way so that we're not bumping into it with our assets are also really good," Sam agreed, "but I'm still glad of these. Great present, Katey, thank you."

Drew nodded his own agreement, his four sizable cocks contained in the underwear you'd gotten him. "Can't say I'm a great fan of the rules around artificial wombs, though. I get that we can detect dysphoria and body-image issues perfectly now, that's why the changes for trans people work--though personally I think our bodies are perfect as they are"--his wives nodded agreement--"but it seems like the sort of thing that should be available to everyone. Why should someone have to go through being projected in a pregnant body if they don't want to?"

"I think there's a case to be made either way," you said. "When the sim was designed we were trying to emulate life on Earth as closely as reasonably possible, given that we'd be living in a hentai, and could remove pretty much all physical ailments, and pregnancy's part of that. The artificial wombs were introduced specifically for people who couldn't otherwise reproduce given their simulated physiology, or experience body-image issues from having a pregnant form so severe that the same is effectively true for them. Besides, while there's a lot of redundant server capacity to account for boundless population growth, even that has its limits. We're going to have to implement controls at some point in the future. Probably should have done it at upload, honestly, but too many of us would have revolted and probably scuttled the entire project, and you know where that would have gotten us." In truth, there were no such limits any more, since your upgrades to the station provided for infinite storage, infinite memory, and infinite processing speed, but you weren't about to reveal that. You could roll it out piece by piece and just make everyone think that they'd built better machines way back at the upload, so there'd never be any need for population controls. It made a good excuse to avoid overriding the council's decision, though, which you generally preferred to leave in place unless they were flagrantly unreasonable. "So keeping some barriers to population growth, giving people another reason to think before just reproducing willy-nilly, is probably better for the long-term health of all of us. And the artificial wombs are limited: can't have a multiple pregnancy with them, and you can only use them once every twenty years. So you've got to think about using those, as well."

"I guess," Drew said, your status in the simulation forcing him to at least accept your point of view as reasonable.

"Now, what I think is great," you continued, "are the changes to permit multiparent reproduction. Now that it's based on intermingling of genecode, there really was never any reason why it was only two such that were used to generate a new code. No reason it can't be three or four, or even more than that."

Sam and Alex nodded fervent agreement. "It's definitely something we both like," Alex agreed. "Doesn't take much, either, just some sexual contact linking all those involved, so there's no need to get horribly tangled, you can just chain all the people you want to have involved."

Sam added, "Between that and the compression clothes"--you'd given all three a full set of your entire lineup, supposedly as a gift from their filthy rich sister with few expenses, so she switched hers out for a hoodie that brought her bust down to Nora's size, even derendering her lower breasts entirely--"I think we're just about ready to get knocked up. Quadruplets in each of us, ideally, but that's still up to chance."

You carefully didn't chuckle or grin at that.

"Should I leave you three to it, then?" you asked, already knowing the answer as you made your bare feet emit exactly that odour which was most arousing for Drew.

"Actually," he said, as you knew he would, "I'd rather you fuck them while I pleasure your feet." He did sound a bit embarrassed about that, but you knew it was because he was asking you to screw his wives. He'd never been ashamed of his foot fetish, and took every opportunity he could to worship yours. He had a reputation at the city's nightclubs as a person who'd drop substantial sums of money to get up close and personal with the feet of just about anyone who worked there.

Thankfully for his habit, you'd arranged a well-paying sinecure that had him doing very little actual work. What good was controlling the sim if you couldn't use it to make your family's lives a bit better? You'd done the same for your dad, as well, so he and your mom pretty much stayed at home all day and fucked, given her perpetual pension as a former nurse. The simulation's algorithms made sure that they couldn't get tired of having sex, even though they were firmly monogamous and weren't interested in anything particularly kinky.

You nodded. "Well, if you insist. Sam, Alex? Remember that you've got to be touching as well. And handholding, however lewd that might be, doesn't count."

Your sisters rolled their eyes in unison before Alex removed her bras, her breasts immediately springing out to their true size, furniture and even walls jumping away from her to accommodate her gigantic rack. Sam did the same a moment later, and they each reached over to caress what little bit of projected boobflesh they could reach on the other.

"This does make it a bit awkward, I'll admit," Sam said, "but I still have no regrets about these things. Still can't thank you enough for the wedding present, Katey."

"So this'll work if I fuck one of you and finger the other," you noted, freeing your own massive cock, bigger than any of Drew's by some margin. "Care to wiggle under your wives' tits and get to work on my soles?" you added, turning to your brother-in-law.

Sam and Alex had both rotated forward a bit to rest on their boobs, feet in the air, so you had to climb up just a bit as well to get lined up properly. Drew crawled under them and immediately got hard as the odour of six feet hit him.

"There's really nothing to choose between the two of you," you pointed out, "so Alex is getting my dick this time. Her name has more letters in common with mine than yours does, Sam." It wasn't much of a rationale, but it let you make the choice since you actually did have to choose and couldn't leave it to photons intersecting a solar panel.

"Why didn't you just flip a coin?" Sam complained.

"Because I thought this was funnier," you said before plunging into her twin's cunt. One of your hands got to work on Alex's anus, while your other stretched around to work at both of Sam's holes.

It didn't take all that long before the simulation began processing eight new genecode sequences, synthesising all four of yours into something new. Of course, since it was supposed to be partly random, you had to make those decisions anyway, and since you were personally involved you took a conscious interest in the result.

After that, it was entirely performative, Drew licking and massaging your feet untiringly, having gotten rid of his compression briefs and shooting load after load of cum, Sam and Alex squirming as you made sure that whatever parts of them you hit were highly sensitive erogenous zones and as their nipples rubbed against the textured carpet as they moved back and forth slightly, and you eventually alternating between Sam's and Alex's twats, making sure that both of them got your cock in equal measure by the time you were all done.

Once that happened, you pulled out and jumped down off of your sisters' busts, and Drew crawled out from underneath. "Want me to clean that off for you?" he offered. He preferred pussy, to be sure, but the simulation made sure that nobody was actually turned off by sexual contact with anyone else's genitalia, except for the relative handful who experienced revulsion from sex, or at least conjugal sex, altogether. You'd restored that aspect of human sexuality because you didn't like that everyone had been **** by the simulation's programming to enjoy sex, at least not for those who almost refused to upload because of how horny life promised to be afterward.

"Thanks for the offer, but I think you've got some more feet that could use some love," you said, making your sisters' feet pleasantly pungent. "I'll get Tina or Isabel to do it."

Drew nodded before diving at his wives' feet.

"Thanks for the spunk, sis!" Sam called.

"Great seeing you as always," Alex added.

You nodded in acknowledgement and stepped out of their apartment fully nude, the new teleportation permissions meaning that you didn't have to hide that you weren't in the hallway outside afterward, instead reappearing in the doorway to your own, which you'd similarly long since made Tina transfer from her name to yours.

"Hey, Katey," the lamia said. "How were your sisters?"

"They were good, as always. Fucked them, they actually wanted to be knocked up this time, so all four of us are going to be parents now."

"Your dick's looking messy," Isabel observed. She was hoping you'd **** her to clean it off, of course.

"I've got other things that are messy as well," you said, chuckling, siting on Isabel's face as you made her move into the appropriate position. Decades prior you'd told Tina what you had done with Isabel, so there was no need to hide your control of her when it was just the three of you. "Want me to **** you as well?" you offered your friend.

"Hmm, cleaning your cock because I want to or cleaning your cock because you made me. Hard choice," she said playfully. "What if it's both?" she said, miming scooting away from you.

"Get over here and get that noisy mouth of yours on my dick," you said, laughing.

Tina naturally obliged and you relaxed into the familiar sensations.