Nellie's Nanite Infection

SNU-5 was a military funded biological enhancement protocol designed as a nanite based response to the large number of bipedal armored vehicles (popularly known as mechs). The primary goal of the program were to produce humans that could feasibly go toe to toe with a mech. It was an abject failure. Field testing showed that the enhanced soldiers consumed far more under combat conditions than could easily be supplied, their system could not deliver enough oxygen to allow them to retain their previous muscle memory, and trying to adapt existing weapons simply by scaling them up failed. Needing to retrain years or decades of learned skill and launching a weapons development program for every small arm, as well as developing the supply chains to get those to the front, undermined the underlying intent of the program, namely to produce mech capabilities without mech development costs.

A secondary problem was that the nanobots needed to remain active in the subject, in order to continue maintaining the subject's metabolism and structural integrity. This meant that enemy theft was always a worry, and that nearby soldiers could be unintentionally infected by the nanites, since they could spread through bodily fluids.

...

***

Nellie groaned as she looked into the night, rain pouring down outside. It was a couple minutes walk to the bus stop, then a significant wait, without a shelter. After a few moments, she grimaced, and headed out into the night, trying to think about schoolwork rather than her already sodden clothing.

*Alright, need to get that calc project done... then biochem....* She managed, before the rain soaked her shirt and sent a shiver down her spine. She shook her head and continued planning, eyes fixed on the lamppost seemingly forever away. Making it to the post, she stood there, trying to keep herself occupied.

"You can stand underneath my jacket." A rumbling voice said from far above. Nellie jumped and looked around. Big enough to blend into the background was a... well, no other way to describe them, a giant. Nearly 20 feet tall, they were wearing a dark rain jacket, one that matched the surrounding woods a little too well. Millie could see their bare feet, huge enough not to compress the ground too much, leading up powerful legs to... well, the shadows concealed the rest.

"Erm... thanks!" Nellie said, flushing at the offer and her embarrassment at completely missing one of the few metahumans on campus. She darted underneath, and sighed as the rain stopped. "Seriously, thank you."

The dark cavern was a warm and humid, smelling strongly of the giant. Maybe a little body odor, but at that size, they were almost constantly sweating, trying to get rid of excess heat from their overactive metabolism.

The giant chuckled. "No problem." Their voice boomed, surrounding Nellie. They shuffled a bit, their foot tapping Nellie and figuring out where she was, and the constant rain on the massive amount of clothing kept the rustling of fabric on fabric going. Nellie looked over her soaked form a bit distastefully. Her black dress and brown hair were absolutely soaked through, and they both stuck to her unflatteringly. She spent a few minutes trying to fix them a bit, but gave up, deciding to deal with it in her apartment.

The rustling kept going, longer than Nellie would have expected, and she could hear the giant's breathing deepening.

She looked up at them concerned, but there was no explanation, maybe just a hint of movement, then a gasp, and Nellie was coated in a strong smelling liquid. She froze, eyes and mouth wide open in shock, as it started to drip down her skin. The giant froze, the rustling stopping for the first time, then backed away, before starting to run.

Nellie looked at their disappearing form in astonishment, then shook her head. Her hair slapped into her mouth, and she grimaced at the taste.

"What the hell was that about?" She asked aloud, as she finally saw the bus coming into view.

***

...

Signs and symptoms

Upon initial exposure to the nanites, they will undergo replication until they reach a critical mass, targeting the endocrine system, altering the metabolism, and encouraging strengthening of the ligaments and tendons, attempting to prepare the body for significant growth.

During this incubation period, it is possible to deactivate the nanites without negative effects upon the subject

...

***

About a week later, Nellie was at the gym, enjoying one of the few perks of being a student and blowing off steam. "Can you believe what they're expecting us to do? That biochem project will take a week to get done right."

"What's it on?" Her boyfriend, Nick, asked walking next to her on the treadmill.

"Metahumans. SNU-5 variant for whatever reason. Like I give a crap about failed military projects. It's not even that impressive, just the first one to get out of the lab and into the general population. And that's after I scared off the only one nearby."

"Oh, the bus incident? You worried that you got infected?"

"No, infection is relatively difficult. It's only spread through blood to blood contact or sex, and it's not like I could even reach that high. Seriously, they would have needed to pick me up and use me as a dildo."

Nick stumbled a bit, surprised at Nellie. Wasn't like her to talk about sex in public. Or private for that matter.

Nellie kept talking. "Or bukkake me? I doubt that the men can do much with a normal woman, and if their cum shots increase... well, by volume they're something like twelve times normal men, so... I'd guess that per ejaculation? But the hormones also tend to stimulate sexual characteristics... Let's say they cum the same amount as one of those things on your phone. Haven't seen anything in my textbooks. Would have made those more interesting."

Nick was beet red. "You feeling alright?" He asked.

Nellie smirked at him. "Yes, and I can tell you are feeling great." The smirk shifted into a leer, as Nick realized that he was tenting. He tried to reposition himself, as Nellie laughed huskily. "Is that what turns you on? The thought of me getting covered in jizz? Or is it of you being used as a dildo for a giant woman?"

Nick shook his head, and tried to wrap his head around the situation. "One of many things, yes. And, now, I know you like getting hot and bothered in public." He grinned as he noticed her nipples pressing through her sports bra and shirt.

She laughed, and they spent the rest of the walk, getting increasingly explicit. Most of two miles later, Nick looked at his phone, and made an unhappy noise. "Erm, I need to get home and get some work done. I'll text you later." He said, sliding off the treadmill and dashing out of the cardio room.

Nellie watched him go, still feeling energized. For all her complaining, she still had a while to work on her projects, and she'd had so much energy recently. She was sure that she'd lost a little weight too. Idly, she pulled up an introductory workout plan on her phone. For some reason, she really felt like lifting some heavy shit.

***

...

Once critical mass is attained, substantial growth will begin. The subject will become ravenous, followed by lethargic. They will rapidly grow towards the upper limits of human potential over the next 48 hours. Frequent full body spasms will occur, stimulating connective tissues and reducing the incidence of torn muscles.

...

***

Nellie had been scaring Nick a bit over the last week. Every time he'd seen her, she'd been working out or eating. He couldn't disagree that it was working for her, her clothing had become looser around the waist, and tighter around the arms and ass, but... it shouldn't be this quickly. It should have been weeks of dedicated training and dieting to make those gains. Maybe she'd gotten some designer cosmetic hormones or something. They were pretty outrageously expensive, but not that uncommon. Hell, the entire high school football team had gotten disqualified for basically mutating themselves into bulls with overdosing. Was pretty funny when they'd had to stop and most of them had grown massive boobs.

Still, she'd said she'd meet him in the dining hall. He pushed his was through the double doors and looked around. He thought he saw her dress, and started heading over towards it, then froze, gaping.

She'd claimed an entire table to herself, and it was loaded with half empty plates. She was eating almost frantically, and managed to wave at Nick. He walked over at her, concerned. "You feeling alright?"

"Yeah, never better. Just finished a half marathon, a couple hours swimming, and a lift." She said proudly, pausing from eating for a moment, then her nostrils flared and she turned back to the food.

"What the fuck? Why aren't you dead?" Nick managed, and got a shrug in return.

"I'll go to the hospital after this, if you get me more food?" She offered. Nick rolled his eyes and sighed, but nodded. There was no way to make Nellie do something she didn't want to do. He headed off towards the buffet line, and swiped his card, then started loading up on all of Nellie's favorites, heavy on the carbs, fats, and proteins. Then he paused and called the hospital.

"Hello, State Tech Medical nurse's line speaking." A cool feminine voice on the other end said.

"Hey, my girlfriend has eaten a table's worth of food, after doing an iron man. And she didn't really start to exercise until last week."

The woman on the other end clicked her tongue in thought. "Sounds like some hormonal overdose. She seem in any immediate danger?"

"I... don't think so?"

"Alright, you're at the dining hall presumably?"

"That's right."

"Ok, we have a few EMTs in the area. I'll ask one to head over and check her out. We'll send an ambulance if anything's wrong."

"Erm... thanks! You do this a lot?"

"Fairly often. Biggest difference is that it isn't someone who passed out because they got their first erection after the hormones took."

Nick laughed, then stopped when the receptionist didn't. "Well, thanks for all your help. Hope I don't need to see you soon."

"Good luck with your girlfriend."

Nick hurried back to the table, putting the food within reach, and starting to eat his own. Nellie excitedly went for the plates, gulping it down as fast as she could. Twenty minutes later, a blue suited EMT walked through the doors and looked around, then headed over to the eating couple. She stared at the pile of plates for a few seconds.

"You still hungry?" She asked Nellie. Nellie nodded, looking pleadingly at Nick. Nick sighed and got up, heading for the line again.

When he'd gotten back, the EMT was on the phone. "Yeah, looks she's eaten enough food for a couple weeks. Her stomach is visibly distended. If it's just from this meal, looks like something big's about to happen, which probably means something not hormone related." She listened for a few moments. "Yeah, that's what I thought. Has Sarah said anything? Nope? Alright then. We'll put it down to chance infection and try to get her under observation. Get some food ready for her." She hung up her phone and looked at Nellie.

"Alright, we think you might have been infected by something. Would you mind coming with us to the hospital? We'll have more food ready." The EMT promised. Nellie had started slowing down, looking increasingly tired, but managed to nod.

"Yeah... I... how much did I eat?" She asked, looking around, then down at her stomach. It looked like she was carrying triplets. "That's.... not good..." She said.

"Can you walk?" The EMT asked, approaching Nellie and putting her own arm out, letting Nellie grab on. Nellie nodded and slowly got up. The three shuffled for the door, Nellie leaning on the other two as she started to collapse. The EMT put her shoulder underneath Nellie's armpit, taking most of her weight, as Nick did the same on the other side.

They managed to get out to the curb and they sat down. A few minutes later, an ambulance pulled up, and two more EMTs put Nellie onto a stretcher, then loaded her in. She was totally passed out, motionless aside from occasional muscle spasms, running from foot to head.

"You her relative?"

"Boyfriend."

"You know how to get to the hospital?"

Nick nodded. "Bus will be here in 20 minutes."

"Yep. Don't think she'll need surgery, but she'd probably appreciate you being there for her."

***

A couple hours later, Nellie stirred, groaning as she blinked her way awake.

Nick was sitting by the hospital bed, doing homework on his laptop, which he hurriedly closed as her heard her move. "Hey, how are you feeling?" He asked, eyes full of concern.

"Sore... full." She managed. "Water?" Nick hurried over to the sink and got her a glass. "What's wrong with me?"

"SNU-5... they think you're going through stage 2... so you'll be in and out of consciousness for the next few days. I think you've already grown an inch."

"Damn... SNU-5? I wonder if... that'll count for the project?" She asked, then started drinking, splashing most of it over her front.

"Hey, careful with that. It'll be here when you need it." He said when she finished, refilling it and putting the cup on the bedside table.

"Thanks... I... yeah... we'll... have a lot to talk about." She managed, eyes already closing again.

Nick nodded, and watched her go back to sleep. He sat back down, as she slept, multiple IVs keeping her body full of the nutrients it would need as she kept growing, muscles twitching as they grew too.

***

When Nick woke up the next morning, Nellie's stomach had largely shrunk back down, the huge quantity of food being burnt to help her grow at the insane pace she was. Numerous empty IV bags were on stands, left there by the nurses trying to make sure that they could keep track of everything that had been pumped into her body.

He could tell that her shoulders were significantly broader, her arms longer, muscle more defined. Most of the pudge around her face and neck had disappeared, burnt to provide calories. He wasn't sure because of the blanket, but she had to be most of a foot taller, definitely taller than he was.

He blushed as he felt a familiar hardness at the thought, but couldn't tear his gaze away as he continued down her body, appreciating every new inch and change.

After a few minutes of staring, he finally managed to pull himself together enough to realize that he needed to use the bathroom, and that he really needed to head to class. He ripped out a piece of paper and left it on the table, saying he'd be back afterwards.

***

By the time Nellie was ready to be discharged, she was head and chest taller than Nick, nearly all fat burned off her body by the extreme strain, and she looked absolutely exhausted. She was only wearing an extra long patient's gown, which reached partway down her thigh, and Nick couldn't help but stare around her crotch, and her feet, which had grown even larger to support her much greater weight.

"Alright, you're going to need to eat a... frankly stupid amount. You're only a bit more than a third of your final height. At least probably. There's some variation, but you'll definitely need to keep enough fat to keep the nanobots happy. Go to the pharmacy on your way out, there's a lot of supplements you'll be taking to prep for the next two phases. And don't be too surprised by any urges. Your hormones will be going wild, and a lot of built in blocks have been removed. We've given your boyfriend some hormone pills to take if you find he can't keep up." The doctor that had been supervising Nellie said as she prepared the proto-giant for discharge. "We'll see you in about a week for a followup check on your nanobot levels. We can figure out whether or not you'll need to stay here for observation at that point."

Nellie nodded, looking a bit embarrassed. "What about clothes?" She asked after a moment.

Nick perked up and pulled out a pair of sweats and a large shirt from his bag. "I have some stuff here. I wasn't sure how big you were, so I just went oversized. We can get more stuff when you get home."

"Oh, and you should drink at least four of these a day." The doctor said, putting a large protein shake into Nellie's hand.

***

Nellie looked around her apartment, still getting used to her new size. She could reach up and put her palms flat against the ceiling, and the fridge seemed... far too small. The counters were filled with protein powder containers and premade protein shakes that Nick had been transporting back from the hospital, for when she got hungry between meals.

She walked into her bedroom and stripped out of her clothes, looking at herself in the mirror. She... was very thin. Not enough time for her body to actually fill out, and she could see each muscle clearly, but skinny strong, not real strong. Not yet. That would come later, after the next stage. Still, her hips gave her a nice hourglass figure, and her ass had promise. She couldn't deny she wasn't looking forward to this a bit, especially after staring at SNU-5s for the last couple weeks for her research...

She took a long drink of the shake, and sat down, the mattress practically collapsing underneath her weight. Then looked at one of her old shirts. It was... tiny. Kid sized. For someone a foot shorter and with shoulders two feet thinner. But she didn't have much muscle mass.... She shrugged it on, the fabric around the neck splitting as she forced it over. It used to cover her easily, reaching past her hips. Now... it was a belly shirt, if it was a bit more comfortable. She smiled to herself, and made a stupid muscle pose, and froze as the shirt ripped along her back. Fuck... she didn't look it, but there was a lot of strength in her body. Nellie took another sip of shake, and started getting dressed in the clothes Nick had picked out. They weren't complementing, but... they'd probably only last a week anyway.

***

...

When patient reaches 2.5 meters, the nanobots will being to optimize the body for further growth. Medical attention will be necessary to supply the body with sufficient materials to prevent severe harm as the nanobots carry out their programming from this point forward. Growth will halt temporarily as the nanobots replicate in preparation of the next phase, and hormone production is increased.

...

***

Nellie and Nick were at the dining hall again. Nellie had filled out a bit, her nanobot boosted metabolism adding pounds of muscle and fat to her frame a day, as she spent her time eating and working out, entirely at the doctor's orders. Nick was largely in awe of her, and delighted in getting her more food, water, protein shakes, and... relief.

The changes had spurred a significant boost in all her systems, and being cornered by his towering girlfriend, eyes level with her growing boobs, distracted by her hard sensitive nipples, seeing her horny grin, watching the wet patch spreading from her dripping crotch, was becoming a daily occurrence. Definitely something he longed for and lusted over... She finished another plate and caught his eye, then slowly got up, the table groaning as it slowly stopped straining underneath her massive frame. She started walking off to the bathroom, her pants tight against her defined ass and thighs. She looked back over one shoulder, eyes glinting as they invited Nick along for the ride.

Nick's cheeks flushed red, and he dropped his fork and knife, cock springing to attention as he followed at a hopefully discrete distance.

A few moments later, he opened the door to a nearby janitorial closet, and a massive hand clamped around his waist, nearly lifting him up in the owner's eagerness to get at the goods underneath. Moments later, he was naked, blushing, looking up at Nellie.

As much as Nick enjoyed having sex with his girlfriend, and he could still stimulate her most sensitive parts normally, there was something about her gently taking his arm and using him as nothing more than a toy for her own enjoyment, fisting her massive slit.