FSE

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"Drive around to the back, sweetie," Adrian said as he pointed to the testing lab's loading entrance.

"Hmm?" Iolvin looked over and spotted a ramp with 'No Entrance' written nearby in various places. "Well I guess that doesn't apply to you, huh?"

"Nah, we get samples and equipment every week from there," Ilaria butted into things. "Some of it's large or dangerous so it's better to avoid the offices."

Pulling up to the end and shutting off his jeep Yoyo said, "Alright, you lead the way honey. Never been back here before."

"Yeah, and I can't get over that high curb. You're helping, bro," Ari practically commanded.

"Well I'll get the door then." Dee slipped out the car and pranced over to the curb. Hopping over and straightening his dress he playfully warned, "Just don't touch anything fancy-lookin' alright? Some of this stuff'll take your sexy paws off."

The three slowly made their way inside the lab, only to wait for the humming lights to flicker on in various groups. Then without much warning they all dimmed to the point you could still make out the layout but not much else. Dee just walked into the central area normally and gave away the reasoning for this action; the floor panels were pressure sensitive and raised the lighting around any furs walking over them, perhaps to save power or to avoid distractions. Once the lighting started playing across the room the drab yet contemporary concrete and steel decor came to the surface.

"Uh, interesting place." Yoyo followed behind Dee after he made sure Ari was alright on her own. "So what's the reason we're here, anyway? And where's your sister?"

"And why haven't I heard of her?" added Ilaria.

"She's on her way. Fancy doc's got a nice car too so she's gonna get here fast." Dee paused with a claw scritching his chin. Perking up with a slight coo beneath his breath, he danced over to a machine against a wall of large gas bombs and storage shelves. "This! Came in a month ago and we couldn't do anything with it yet. No test subjects, at least."

"What, a machine? How's that gonna help her?"

"Yeah," Ari compounded the question, "I'm not sure even I know what this thing does. It's not weapon's tech?"

"Nope, med tech! Not your cup of tea, heeeeee." Dee tapped the stoppers on the machine's rollers and pulled it out into the open. "Um, we'll probably need a bed or something..." He pointed over to a couch against the opposite wall they'd brought in to make the place cozier and made a pleading face to Yoyo.

"Right, I'll get it honey."

"Ahem, as I was saying... uh..." He lost his sequence of thought for a moment and made a quirky face over it. "Uh... Right! This thing makes nanites!"

"Nanites? Like, little robots?" Ari queried further.

"Yeah, sort of like that. But these guys are designed to simulate living cells." Dee found his lab coat and pulled his arms through the sleeves, otherwise leaving it loose. "They were designed to regulate body chemistry. Well, to keep toxic gasses from poisoning soldiers, but they ended up fixing more than that. In small test subjects though."

"And that's supposed to comfort us how?" Yoyo asked as he finished moving the couch.

"Well the only issue was that the smaller subjects couldn't metabolize enough energy for the bots and they shut down." Getting a bit quieter he added, "...And the bots are sort of toxic when deactivated."

"Honey, I'm not sure this is okay for Lulu," Yoyo frowned, sitting down on the couch with a sigh. "Maybe we should just go to a doctor or hospital or whatever..."

"No, there's a valid point, Yoyo." Ilaria joined him on the couch, leaning against him. "Being larger, and with my crazy metabolism... the bots might work on a fur like me. And they'd balance me out..."

"Ooh, that's my sis! One sec, peeps." Dee pulled his phone out his purse and tapped something into it with a smile. "There, she's coming around back. Now we can do this right."

In a few minutes the rear door opened again and a figure stepped through. "Yoohoo! I'm here, DeeDee!" The voice was a bit off, but the others didn't seem to take much notice, until the new otter walked closer anyway. "So what's the big commotion, sis?"

"Oh gods, there's two of them," Ari droned out..

"They're multiplying. We're all doomed," Yoyo finished the joke.

"Yeah, yeah. Guys, meet my sis, Ellie." Dee walked over to his similarly cream and white coated sister and gave a long hug. They looked quite alike, except for Ellie being slightly larger and Dee having 'freckle' spots on his snout and shoulders. But in one key way they were quite alike; Both 'sisters' were really brothers. "Sis, these are Ari and Yoyo. Ari's the one you're here to check out and all."

"Uh, nice to meet you, Ellie," Ari greeted with an offered paw. "Is that short for anything?"

"Elliot, dear." Ellie shook her paw and then offered her own to Yoyo. "And you must be the hunk I heard about this morning... Always nice to meet my sister's 'friends', yes yes."

Softly taking the girly boy's paw Iolvin got down to business. "Nice to chit-chat and all, but if we don't do something soon I'm afraid what I'll do around my sister. What's the plan?"

"Well, Ellie checks her out, we program some nanites, drug her up, and then shoot her up. Ellie's here to make sure nothing goes wrong, really." Dee grinned and nudged his sister's shoulder. "She's always been good at damage control, heeeeee."

"And Dee's been good at making the messes, hee heeeee," she quipped back.

"Okay, this is just creepy," Yoyo chuckled.

"Well do what you need to do then." Ari stood up and took a look at the machine. "I'm getting... anxious."

"Sure, hon. I won't sacrifice your safety to go faster though." Ellie grabbed Ari's lab coat and put it on herself, giggling at the way is was too large for her. "You guys have hypos? A sequencer maybe? All the standard goodies?"

"Yeah, I'll show you around real quick sis," Dee stated as he went over to the general supplies. "And you two, no touching that thing. I mean it."

The two sisters went from station to station, gathering whatever they needed onto a stainless steel tray. Syringes, beakers, sterile pads, and all the fixings eventually wound up on the platter and wound up next to the mysterious nanite machine. The two eventually popped on sets of latex gloves and got to work, drawing a bit of blood from Ari and running bits and pieces of it through different machines. Eventually Ellie came back with a notepad chock full of values that made no sense to the rest of the group, though the smile on his face made things look positive enough.

"Well, you're healthy physically Ari," Ellie stated as she read things from her notes. "Chemically you're a mess though. Elevated levels of both sex hormones, hence the... anxiety, was it? Hee heeeeee... What really concerns me is the growth hormone in your blood. If I had to guess, I'd say you're going through puberty again. Considering we don't have a DNA sequencer here I'd guess you're one of the forms of intersex that gets a dozen puberties in their lifetime." He placed a paw on Ari's shoulder and added, "Sadly, that shortens your lifespan and makes things difficult in the latter half..."

"And if the chemistry is cleaned up to match a non-intersex fur's?..." Ari murmured.

"Ari, dear... Your metabolism is in the theoretical working range for these nanites," Dee cut into the conversation, having performed enough of the tests himself. "If nothing goes wrong with them, you'd probably live a more normal lifespan. But if the bots die out, your immune system will overreact..."

"You'd pass away slowly and painfully, hon. I've seen those types of infectious reactions before, and it's not pretty." Ellie leaned closer and rubbed Ari's shoulder a bit. "There's a chance it'll kill you, but you've only got another ten or fifteen good years left without it. The decision's up to you, kiddo. I can't make it for you."

"...I'm..." Ilaria started tearing up, the news suddenly hitting her all at once. "I'm fucking what?!"

Yoyo joined in with a tender hug, his own eyes watering up. "Fuck, sis... just... fuck..."

"No! No feeling sorry for me!" Ari shoved her twin away, hunching over herself instead. "I'm not gonna do it. I'd rather live what life I have left... WITHOUT you guys feeling pity for me..."

Yoyo just forcibly grabbed his sister's shoulders and looked her in the eyes, determined to get his point across. "And I say no! You think I'm just going to go on living my life without you? We're twins, Lulu. You know what that means?"

"But I don't want to die, damnit!"

Iolvin looked over to Adrian as he said his next words, silently sending him a message. "Lulu.. Ielunschra... We're twins. We're always the same. So if you die..." He just paused and stared at Dee for a moment until the little otter, tearing up himself, nodded back. "...I'll die too. One way or another, it'll just happen. And if I'm gonna kill myself, I'm choosing the way that gives us both a chance to live happy lives." Again he looked to Dee and added, "I'll do the procedure too."

Ilaria stared at her brother, tears dripping down her fur faster than ever. "You'd do that?..." She collapsed on Yoyo's chest and whispered, "You've always sacrificed so much for me..." With quick, shallow nods she finally agreed, "Do it. Time for me to repay all that."

"Lulu..."

"So... You're sure about this guys?" Dee spoke up.

"Yeah, babe." Yoyo stood and gave his new love a kiss. "If it keeps us alike, I just can't say no."

"I understand, Iolvin..." Dee held onto Yoyo tightly and looked to Ari. "And you too, Ilaria? It'll hurt like a bitch."

Ari stood up and gave a firm nod, one soon copied by her twin. "It's either this or decay away in a hormone rage. I'm with my brother."

"That's so cuuuuute!" Ellie interjected. "They even think the same, hee heeeeeee!"

"Ellie..." Dee started to reprimand his sister, but decided to drop it rather than derail the decision at paw. "Okay, here's how it works. We put you under as best as we can... and I think we can synthesize something good for that fast enough. Then you get a needle I'd rather not describe to the heart. A few hours later the pain's supposed to stop and the nanites will have adapted to your systems. Then we just wait and run more tests in a day or so."

"Right. But Dee, I need you to do something for me. After we start... I need you to call Robby for me. She..." The girl started tearing up again and just gave another nod to Adrian.

"I'll call her." Dee eased the two back into the couch so they'd be comfortable. "Anything I should tell her in particular?"

"That she loves her very much, right?" Yoyo spoke up, staring at Dee like the message doubled for him.

"But don't tell her about this yet. I don't want her to worry about me..." Ari slumped back and clarified, "If my next day or two are all I've got left, I want to enjoy that time with her."

"You got it, Ari."

The two sisters quickly got to work making a rough analog to morphine as well as rigging up a nitrous system from some of the gas bombs. Combined they seemed to be overkill, nearly knocking out the others rather and putting them into a sort of euphoric stupor instead. Still, once the twins were sedated sufficiently Dee quickly went over to the nanite foundry and spooled the motors into action. The machine hummed with light from certain crevices, giving merit to Dee's warnings earlier. Once the machine finished the first batch he went to replace the syringe with a fresh one and proved just how hazardous the machine could be.

"FUCK!" The freckled otter pulled his paw away from the machine, drenched and spattering red. "Fucking FUCK!"

Ellie hurried over and snatched that paw to inspect it. "What happened, sis? You never use that sort of--" He stopped himself when he saw the otter's paw was split partway down the center, between the middle digits. "Shit, sis... We need to get this wrapped up fast."

"Is it gonna be okay? Damnit, tell me it'll be fine!"

"Shush, Dee Dee. I know a good paw surgeon that owes me a favor." Ellie dragged his sister over to a first aid station and held his paw up high. "Just keep it elevated it'll be alright. Not let me get some suture strips on it, ya' little crybaby."

"Th-thanks Ellie..." The otter did as he was told and kept his paw raised even after Ellie let go to open a packet of gauze and a few suture strips. "Uh... What about them? We can't leave them like that while I get this fixed."

"No, we can't. Which is why it's a good thing you've got a six hour window before nerve damage." Ellie smiled playfully for a second, then slipped into a more sincere grin. "You care about them a lot, huh? And this Yoyo... Mmm, I could see that stud meaning a lot more than most."

"He's... a really nice guy. And he'll do anything for his sister, so this is just not negotiable." Dee found himself slacking in his cozy thoughts and raised his paw again. "So the sooner this is done, the better."

"Speaking of... All done!" Ellie replaced what she'd taken from the med kit and smiled back. "Now go back to looking sexy in that lab coat."

Dee walked over with his right paw patched up, using his left to do everything now. He finally replaced the syringe and cycled the foundry for another batch of bots. "Okay, while that works can you help me with Ari here? Sort of need two paws for this big hypo."

"I work with those all day, sis. Just tell me where it needs to go," Ellie said as he took the thing from his sister.

"Uh, it needs to go in the heart." He looked at a screen on the foundry and confirmed, "Doesn't matter where, just anywhere in the heart. Can you reach that with one of these though?"

"Ever seen Pulp Fiction?" The taller otter took the needle and emulated the awkward stab from the movie with a slight "Heeeeee..." and then went into a proper stance. He propped the needle in place and gave a firm thrust. "See, not too bad. There'll be a small bruise but that's fine." He pushed the plunger slowly, not wanting to over-pressurize the girl's heart. "It'll be better in a week anyway."

The foundry finished the second batch just in time, Dee reaching more carefully into the non-furproofed machine for the sample. "Alright, I'll trust you on that. Now do my boyfriend."

Ellie had to hold back a full-blown laugh when she misinterpreted that last sentence. "Sure, I'd LOVE to, hee heeeee." He put down the empty syringe and took the fresh one. "I'll poke him all you want, sis."

"Ellie, I'm serious. Please don't hurt him."

"Ooh, he means that much, eh?" She placed the needle into position and pushed it through. "Don't worry, I couldn't screw this up if I tried. Muscle memory at this point." He dropped the plunger and then yanked the thing free, placing it in his sister's paw afterward.

"So that should do it. now we just wait, I guess." Dee looked back at the screen for additional instructions and summarized, "Keep subjects upright, maintain body temp, blah blah blah."

"Then treat them like they're in shock. I can handle that."

"So," Dee added, "anything else you need for further testing? More blood or anything?"

"I think I'd like to see you suck that guy's cock, hee heeeee."

Dee quirked his head with a frown, not sure what to make of that. "Suck his... Damnit sis, I'm serious."

"Aww, but you always share your toys with me." Ellie leaned over Yoyo and unzipped his jeans, working on his belt next. "I just thought it would be cute, plus I really wanna see what he's packing."

Dee tried to stop his sister but was too slow to notice her actions. "Elliot! I'm serious! Don't fuck with my man!"

Suddenly becoming a lot more concerned, Ellie stopped what he was doing and gave his sister a kiss on the forehead. "I'm sorry, sis. I didn't realize you really liked this guy." He still went back to what he was doing however, dropping Yoyo's pants and his boxer briefs with them. "But I do need a sperm sample from him to be thorough. His fertility might drop from this treatment." Putting a paw to his muzzle at the sight before him he added, "Damn, girl. Now I know what you see in this guy."

"I like him for more than that, idiot. Besides, we only just had sex last night..." Dee suddenly flushed a very visible red under his light fur. "Damn, why do I say stuff like that to you..."

"Haha, because you're cute about sex. But if Yoyo's all yours, sis." Ellie placed a beaker next to Yoyo's groin with a grin. "I only need a little. you can do whatever you'd like with the rest."

"And... what about Ari?" Dee reminded her. "What if she wants to have pups with Robyn one day? Won't she need a test?"

"Ari?" Ellie quirked her head over to the girl's skirt. "She's that much in between? Huh... Dibs."

"Just... do the minimum, alright? She's got someone too."

"Nuh-uh..." Ellie lifted Ari's skirt over her hips and stared at the bulge in her panties while practically drooling on himself. "Doctor-patient confidentiality..." He pulled her panties to her ankles and did a double-take. "I'll uh... I'll do whatever I deem appropriate... Okay, enough joking. This girl's HUNG."

"Hmm? Wait, you're serious?" Dee moved between his dazed man's legs and reluctantly placed a paw on his manhood. Looking back to his sister he then only found it in himself to comment, "Oh wow, her foreskin's cuter than mine..."

"Why's she even got one?" Ellie queried as she started rubbing that sheath up and down to get Ari's motor started. "I've never seen a family only do the one pup. Especially not with twins."

"Her family doesn't know. She says she..." Dee's paw started rubbing up and down Yoyo's length all the same now. "...well, grew into it. Is that much change normal?"

As Ilaria grew into Elliot's paw he couldn't help but chuckle his next words, "Yeah, sometimes that happens." As the girl's member grew to nearly full size and clear of her foreskin, Ellie rubbed the tip to gather some of the pre liberally dribbling from it. Then he started stroking properly across the whole length and giggled over to Dee, "This one's like a damn pony. I've gotta taste this baby. Ooh! You should blow Yoyo too! I love watching you go at it."

"Sis... No can do." Dee really started getting into the groove of things on his end and started alternating playing with Yoyo's balls and tip, finding he was moaning and tensing when being fondled in those areas. "Hmm... Trust me, I want to. But I want him to be conscious for the first blowjob I give him, you know?"

"Aww, that's cute. Well, I won't force you to ruin things if he means that much to you, sis." Ellie licked his tongue slowly from the base of Ari's shaft all the way to the tip, then back to the base again from the other side. "Mmm... I'm glad you finally decided to get in a real relationship, really. I'm proud of you, sis. Owhm..." With his hunger still going insatiated, he finally took as much of Ari into his muzzle as he could without pushing into his throat, the otter being the less experienced in the area of the two sisters.

"Ugh, can't you just paw her off like me? I mean it, that's not right with her and Robyn..." Dee really started to lose it when he saw his sister going to town on Ari's cock and decided he needed to end things and take a step back. He spat on a few fingers and worked them slowly up Yoyo's virgin ass. "Just get it in the beaker, right?"

Ellie attempted to nod on Ari's length, but eventually pulled back to clarify, "Yeah. I only need a tiny bit but try not to contaminate it." He then went back to work bobbing and licking that rod of flesh.

"Well, I'm bowing out. This should do it." Dee prodded around inside Yoyo's ass until he found a soft swell of muscle that made the boy squirm in broad motions. Once he found Yoyo's prostate he rubbed it back and forth with a firm press with his good paw and reached for the beaker with the other. "Come on, sweetie..." Then Yoyo suddenly spasmed and shot a stream of cum into Dee's eye, the girly otter quickly pulling his paw free to angle that cock into the beaker. "That's right, just like that..."

Almost choking when he saw Yoyo's first shot, Ellie pulled his muzzle off of Ari and resumed stroking. "Damn, that's a good amount!" He suddenly found himself desiring his own money shot and really started speeding things up on Ari's cock. "All over your face, too. That's hot, sis."

"Ick, now I'm bloody AND sticky..." Dee continued stroking his man's length firmly but slowly, making sure to clamp down on his knot. "Ooh, he likes that! Heeeeeee..."

Wondering what Dee was talking about, Ellie leaned closer and saw the larger base of Yoyo's member. "Wow, a knot? How's that...?" He briefly paused and then took a look at something his own paw was bumping at the base of Ari's length. "Shit, they've both got 'em?" Ellie's eyes fixed on that swelling knot, his paw rubbing over it and just cringing to give it a playful squeeze.

"Their dad's a husky. Might have something to do with it." Dee slowed his paw to an eventual stop, Iolvin finishing his orgasm with a light dribble. "There we go. I think..." He took a second to read the side of the beaker. "...wow, 250 millilitres... yeah a cup and change should work."

"Wow, yeah. I only need like, ten..." Ellie finally gave into his curiosity and gave that knot a few squeezes, though the size versus his paw meant the results weren't quite as expected. He eventually went Dee's route and slipped two fingers into Ari's pucker, his skilled paw only having to press the once in the right spot to trigger Ilaria's peak. The first blast caught him not only in the nose, but completely by surprise as it was more like a long stream than anything else. "Gah! They hell...?!"

"Damnit, at least catch it!" Dee took his sister's beaker and hooked it over Ari's tip, bending down so nothing was lost. "Here, take this. You better not waste this, because I'm not letting you do it again."

Coughing up from his sinuses suddenly being invaded by girl spunk, Ellie put a paw on the beaker and another on Ari's shaft to keep it pointing inside. "Kuh! Gah!... Gods, she's like a firehose!"

Even Dee had to stop in wonder at the spectacle before him, the beaker slowly filling up to full and overflowing before Ilaria's flow tapered. "That's... Wait, isn't that a litre beaker?!" He looked at the filled glass and then things suddenly started making sense with Robyn's belly being swollen before. "Damn... Why's she gotta have more junk in her trunk than my Yoyo?"

"Yeah, that's just not fair." Ellie found himself lapping at what little dribbled from Ilaria's tip as well as licking the brim of his beaker like it was a melting ice cream cone. "I know how much you like your hot cum, and she does taste pretty good..." When Ari finally stopped Ellie put the beaker down and slid over to Dee. "Hey, speaking of..." He grabbed a sample dropper and siphoned a bit of each beaker into their own phials, labeling each with the first letter of each twin's nicknames. "...swap with me."

"Hmm? What are you planning?"

"Oh, just..." Ellie reached over for some plastic pipettes and bit off the ends, dropping them into the beakers like straws. He then snatched up Yoyo's glass and started sipping with a smirk. "...fixing drinks. Your guy tastes wonderful, by the way. I approve of him, hee heeeee..."

Dee reached for Yoyo's sample back but Ellie wouldn't relinquish it, eventually downing half of it before they stopped struggling. "What, you want me to taste hers? Is that it? Because I've already had my fill earlier, damnit." He picked up the other beaker and took a sip, frowning back to his sister. "There, you happy?"

With a devilish grin Ellie went back and finished his cocktail with a slurping noise from his straw. "Better not waste that treat, Dee Dee. Come on now, drink up while it's still hot."

"You're not gonna let me just put it down, are you?"

"Not a chance, sister dearest."

"F-fine!" Dee tossed out the makeshift straw and put the brim of the glass to his muzzle. Then with squinted eyes he tilted it back and chugged down the contents as quickly as a syrupy liquid really could be chugged. About halfway through he tried to stop, but Ellie placed a paw beneath the beaker and made it tilt further. After having forced the entire litre of cum down his gullet, the otter choked a bit and spat out, "Fuck, sis! I was good until that!"

"Oh, but you know I love to tease..." Ellie joked with a chortle.

"Yeah, and I would have gotten it all anyway... I mean, it's not like she isn't tasty or anything..." Dee looked at the frosted glass a few seconds before it started making him sick to his stomach. "It was just a bit too much is all."

"Aww, there's my favorite cum slut, hee heeeee!"

"Heeeeee..." Dee quietly sounded to himself. "Just don't get any ideas. Yoyo may be yummy but he's mine, okay?"

Making a sign over his chest Ellie nodded and confirmed, "Scout's honor. I just haven't gotten any in half a year. I'm good now." He looked back to Ilaria's softening cock and appended, "I think."

"Good," Dee said as he stood up. "Now can you get these two cleaned up and clothed before they come to their senses?"

"Me? And what are you doing, not cleaning up after yourself?" barked back Elliot.

"I have a phone call to make for the girl you just defiled." Wiping his face off and licking the paw with a smirk, Dee added a joking, "And if you do a good job I might just leave out what you did to Robyn"

"Ooh, meanie!"