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"Pressure stabilized, systems running at optimal capacity. How are you feeling Colin?" Gavin asked, his voice coming in with heavy static over the outdated intercom.

"Good. I'm good. I'm ready," I said, trying to keep the excitement out of my voice. I'd waited weeks for this day. And now that it was here, I couldn't help being overcome with a child-like elation.

We were part of a small lab situated along the Atlantic coast in Nova Scotia Canada. A marine biology department intent on studying ocean ecosystems, long-term effects of global warming, that sort of thing.

Before now, our efforts were laborious, costly, and largely fruitless. But, that was before the wide-spread production of nanites. Self-replicating machines that could alter genetic material on a molecular level without any permanent damage to the organism. It didn't even matter how much the organism was changed. Hell, one lab turned a guy into a fucking maggot and he was reportedly fine!

The possibilities of what such technology could do for us were endless. Not only would we save money on equipment and ensure the safety of our researchers, but we could gather tons of first-hand experience by obtaining attributes of the local fauna. It was a miracle we got access to the nanites at all. It was crazy expensive to obtain them. It took months of requisitions to even get on the waiting list for such advanced technology for non-medical purposes. Still, everyone at my lab hoped that the efforts would be worth it.

I'd volunteered to be at the forefront of this particular expedition. I'd been in submarines, on boats, in scuba gear, any means necessary for a human to view the vast expanse of ocean that occupied so much of the landmass of the planet. I longed to understand it in a better context, to explore it in ways that no human could normally. In truth, I was nervous at the prospect of being in something different than the human body I'd worn all my life. Yet it would be worth it experiencing something in a way no homo sapien had ever done. I hoped.

After some begging and pleading, I was able to convince my bosses on the particular form I'd be taking on. It was one more suited to my fantasies. Instead of being entirely an animal, I would retain enough human attributes to operate equipment. But, mostly, I would be an ocean animal, one capable of living in and going to places no human could. Surviving pressures and depths unfathomed, moving far faster than any human or equipment could.

For this particular initial outing, I'd opted to be part orca. I didn't want to be a fish; I wasn't sure how a partially human brain would adapt to a fish's electromagnetic senses, or how easily I'd be able to interpret my surroundings. It had to be something that could exist in the appropriate biome for the research. I wanted to be something big, an apex predator. There was always the risk of attack from other creatures out in the ocean, otherwise. Orca was therefore the logical choice.

I was garbed in a latex bodysuit as I'd be exposed to chilling ocean water without the protection of orca skin for a short period. I needed to be in the water when the change started so that my added weight wouldn't cause me any unnecessary damage. That was the risk I was undertaking. But for science, and for the chance to change like this, I thought it was worth it.

I was currently standing in a tank bordering the ocean. This was more of a test run. I'd spend a day or two out there to see what the body could do and what obstructions I would encounter before trying a more in-depth and specific test.

One of the advantages of the nanites is that they could be programmed to take a variety of data, temperature, pressure, solute concentrations, and myriad numbers. The purpose of having a human, i.e., me in this case, was to interpret things more directly. And it was a research project all on its own, to be part orca, to experience the sensations of that body. I'd be writing my own scientific journal on the subject, to be sure!

"I'm ready. You can start the sequence," I said, barely able to see my team in the observation area far above. I heard a whoosh as the gates opened and the area began to fill up with seawater. At the same time, I knew the nanites were flooding my system, preparing me for the change that would make me orca enough to survive out on the ocean alone. I wouldn't feel pain from the change, which was a relief. But I could still swear I felt some tingling as the water began pouring into the chamber.

The first real change was in my ass, or just above it, to be precise, I felt my tailbone grow, expanding against the latex bodysuit. It didn't hurt, but there was a strange discomfort as it pressed tightly against the fabric. It quickly thickened and lengthened, as though wanting to burst free. Yet the latex suit was designed for such a thing and was able to stretch to accommodate the parameters of the transformation. I was thankful, as I knew the tail would be massive, more than half the length of my body by the time it was done. I could see it from the mirror I'd been granted in the chamber, large enough for a clear view of my full-bodied changes. I could now feel it behind me as well, a heavy weight stretching out of my spine as it grew longer and thicker. I tried to move it but my body wasn't ready for that, not yet.

My hands began to twitch next, and looking down I could see that a thin layer of black webbing had begun to grow between them. It felt thick and stretchy as the diameter of my hand grew to accommodate it. I wouldn't have fins, not exactly, but the webbing would help me swim.

Something similar was happening in my feet, and looking down I could see the layer of latex suit stretching to make room for the spreading toe webbing being formed. My feet were flattening, expanding to become more like flippers. Normally in an orca, they would be mere rear fins to help steer, but my hybrid form kept all my human appendages in relative order, somewhat a relief for me. Having only a tailfin and front flippers to steer was just too bizarre!

I felt my arm muscles bulking up under the suit, my slightly more defined upper arms showing nicely through the fabric. I smiled at the sight. I knew they had to be bigger for me to swim properly, but I had to admit I liked the way they looked in relation to my slowly growing body. I'd never been the buffest guy, and being able to add this much muscle so quickly was getting me more than a little aroused. It was too bad it was illegal to keep the changes to just my muscles afterward!

One strange sensation began pulling at my back, the latex tightening and straining as something long and massive grew forth painlessly. It was my dorsal fin, a biological element the programmers had decided to leave in, making it easier for me to maneuver in the water. I had to admit, it was aesthetically pleasing.

I watched in the mirror they'd given me as I felt water splashing against my webbed feet, the sensations not nearly as cold as I had expected. It was billowing around my ankles by the time my calves started stretched and my legs lengthened. They didn't bulk up as large with muscle as were my arms. I'd be mostly using my tail for swimming and I didn't need my legs to be oversized for swimming.

I was reminded of my still growing tail as I felt the strange appendage touch the floor. I had to hunch over so it didn't throw me off balance and knock me face-forward. I had no intention of drowning before my changes allowed me to be fully sea-worthy!

My body began to swell with muscle, thick and packed, as the nanites filled out my form. I could feel my tail growing impossibly long and thick now as the tip began to split into massive, muscular flukes. My stomach was stretching longer in conjunction with my lengthening back, the effect making me grow taller. Real orcas were far heavier than humans; I would not reach full orca size but I would easily exponentially increase the size of my human body. I was already several hundred pounds larger than I had been, mostly thickly layered muscles. But there was a hard-packed blubbery there too, making me expand far beyond human dimensions. I needed it for buoyancy just as much as I needed it to stay warm in frigid waters.

My bulbous gut stretched out into my field of vision, obscuring the sight of my flipper-like feet. I patted my panch, feeling how firm and smooth it was to the touch of my webbed hands. I couldn't feel the latex suit as well as I had; evidently, the high-pressure tactile sensation was something that my new hands didn't possess. I nonetheless enjoyed the view as I grew larger, stretching taller and thicker, my arms bulging more massive in relation to my new height.

I let out a sudden gasp as my lungs stopped taking in air, causing a bit of panic to fill my head. I couldn't breathe! I tried desperately to suck in air through my nose but it was gone, as though my windpipe had closed. Just as soon as it had, however, I felt something open up in my neck, a new connection that allowed me to breathe normally. It was so strange having cool air being sucked into my lungs through a hole just before my dorsal fin. I had a fucking blowhole!

I watched as my nose flattened on my head and disappeared into the surface of my skin, no longer necessary. My hair was beginning to fall out, a creeping of blackish skin crawling from under the latex suit and covering the back of my neck and racing up my head. I could feel it spreading underneath the suit, a cool sensation that wasn't at all unpleasant.

My face was beginning to stretch out now, growing thicker into the beginnings of a muzzle. My neck widened to match the diameter of my torso, though not as thick as a true orca's as I could still move it relatively well. My teeth were getting pointed, thicker as more of them poked up from my gums in my expanding maw. As I watched, my tongue fattened in my mouth, growing to fill the space of my expanding jaw.

I had a sudden urge to taste slippery prey between my jaws and gulp it down. The beginnings of orca instinct, most likely. My mind would remain but I would still have some orca thoughts and instincts. It was a useful survival tactic so long as my human mind didn't get too swept up.

My eyes darkened as the black skin overtook them. I could still see just fine, but I could barely tell where my eyes were as the black and white flesh crawled over my skin. I was at least 8 ft tall now, and growing bulkier as the changes progressed to their conclusion.

I looked at myself in the overhead mirror, watching as my muscles bulked up far beyond anything I could have imagined even from hours upon hours at the gym. I was surprised; I didn't think orcas possessed the relative muscle massive I was putting on. Maybe the nanites thought that I'd need the muscles to function as the hybrid creature I was becoming. Whatever the reason, I had to say I was pleased with the results. I flexed a bit, the thick muscle rippling, hard and firm to my touch as I played my webbed hand over the smooth, nearly latex-like flesh. It was more than just a mental admiration; I would have blushed if I could as I felt the stirrings of my cock under the latex suit at the sight of my muscled form.

I was quickly outgrowing the latex suit I'd donned before the change started. It was stretching beyond its limits, and it began to feel more than a little uncomfortable as my body outgrew the restrictive dimensions. I felt a small rip and looked down at my arm, a bit of black skin showing, though it was impossible to tell where my skin began and the latex suit ended. I had an exciting thought; would my massive muscled body break free of the confines of the suit?

I felt a twinge of arousal at the notion, drawing my attention to my cock, which was clearly larger than it had been. Evidently, it had been growing to keep up with the changes in my mass. I felt my balls tingling too, though they weren't expanding. It seemed as though they were pulling inward, still thick and virile, but perhaps more protected now in my internal anatomy.

"Everything ok down there, Colin?" Gavin asked over the speaker as he, too, seemed to realize I was bigger than intended. I just grinned up at him, unable to speak as a series of clicks erupted from my mouth. I doubted he could hear them, but I could. My external ears were gone at this point, but I could sense my vibrations bouncing off the walls of the chamber, an orca's echolocation. It gave me a better idea of the size of the room than by looking with my eyes!

I found myself blushing with arousal. I knew orcas must have large members based on their physiological needs. I was excited that the programmed nanites were giving me a similar cock. I shivered as the thickening rod pressed sensually against the fabric of my latex swimsuit, making me moan and leak. It was coating the inside of the suit in a layer of fluid as the cool ocean water rose around me. It was almost up to my waist, which was at least 5 feet off the floor.

I longed to see how my penis was changing. I could see its outline in the latex, the tip curling. The girth was not as thick in relation to my body but the length was something else entirely! It felt amazing, sending shivers of pleasure radiating through my body as the changing cock tip rubbed sensually over the ripping fabric of my latex suit. To my amazement, it seemed to be wriggling, as though possessing far more motility than I'd ever thought possible.

"Are you ok, Colin?" A voice came on over the speaker once more, my colleagues concerned. I ignored the sound this time, the human noises of no concern to the beast I was becoming.

I started rubbing the trapped orca member under my suit, loving the feeling of it leaking into the water. It was rushing in now, but that was ok. It felt so good against my body, the salty cool fluid rejuvenating my skin. It would soon fill the chamber and I would swim out into the open ocean, to explore my new home in a way no human could have dreamed of.

I was growing bigger still, the changes making the latex suit far tighter than it was designed to hold. My skin was thick, oily, black and white and monstrous as befitting a predator of my stature. I did not need simple human trappings in my powerful form. With a loud snap, the latex suit bust open, exposing my equally black and white flesh. The muscles in my arms swelled and pulled apart the arms of the suit, my sharp dorsal fin tore away the back and my tail ripped the ass end. It floated away uselessly as my orca body continued to swell and grow.

My arms were ripped beyond human confines, bigger than the most massive of bodybuilders and growing still. My stomach was massive but firm, thick and powerful, and streamlined for swimming.

With no shame, I regarded the massive cock that has been hidden within the suit. It was thick, pink, and at least 4 feet long and still growing. The shape was different, but who was I to judge? It looked amazing, and the sensations emanating from it were even more so. I didn't have testicles, not exactly, but I could feel how swollen they were inside me. Feeling the area, my stiff fingers reported some sort of slit between my ass and where my cock was sticking out of. I shivered at the touch, the flesh warm and sensitive.

I took my member in my hands, not caring that I was being watched by my entire team. I needed this. My thick, slimy, pink cock was aching and throbbing and the nanites filled my balls with high pressure seed. I grasped the end of my rod, feeling it grow bigger as I bulked up with more muscle. The pleasure was even better than anything my human self had ever experienced. The sensitive flesh responded even to the lightest of touches from my webbed digits.

The water was getting higher now, up to my waist and still pouring in. I wanted to finish myself off before diving in and swimming out into the ocean. It wouldn't take long like this; my cock was so hard, so needy, I just needed to stroke...

I would have bellowed, if I could, as jet after jet of off-white cum flooded the chamber. My cock spewed load after load as my massive body trembled in pleasure. I could feel every inch of my cock and prostate being stimulated by the powerful orgasmic release. Every wave of cum that my massive pink cock released just made me crave more.

The changes were completed. I looked damn sexy if I had to say so myself. The bay doors opened and I swam almost effortlessly out into the sea to begin my important work for the betterment of mankind. Though at the moment, my only thoughts were consumed with the power and freedom my new form possessed. I was barely aware of the remnants of my latex suit floating away as I rapidly swam into the unknown of the ocean beyond.

******

The next few days passed like a blur for me. I could see the passing of the days, the moon and stars, and the sun. But I was unconcerned with such things. They were merely present as I surfaced to fill my massive lungs with air and dive back down again. I wasn't as big as an actual orca, but I could hold my breath for a good 45 minutes. Enough to explore depths of the ocean that were far off-limits to humans.

I had to confess, the nanites certainly added a level of arousal to my body that I hadn't expected. My new member was massive, far larger than anything I'd ever seen on a human. I enjoyed many hours filling the water with off-white seed, my thick pink cock always hard and needy for more.

It was a wonder I'd gotten any work done at all. I explored as many areas as I could, but that consistent aching from my cock always seemed to distract me. I was sure my team was monitoring every time I orgasmed into the ocean water but I didn't care. Maybe it was the nanites, or maybe I'd secretly fetishized sexy orca muscled bods. Whatever the reason, it was enough simply to pleasure myself with my powerful arms, feeling my thick webbed hand playing over the curled massive pink cock I now sported.

I thought I'd be off-put by eating raw fish but the taste was sublime to my new body. I had a huge appetite to sate, to fuel my massive body and my even bigger lusts. I even managed to hunt down some bigger prey, a seal that had gotten too close to me. That was particularly succulent, keeping me full for almost a day. But it wasn't long before both my pangs of hunger distracted me once more.

I swam as far as I could, exploring valleys, ridges, depths at which I'd only glanced out of submarine windows before now. I saw a myriad of creatures up close that I'd never dreamed of, fish and squid and jellyfish and eels and a multitude of other species I wasn't even sure I recognized. I even heard the far-off sounds of my own kind or at least a species I shared half a kinship with.

The nanites took care of all the recordings as I swam the ocean surrounding Nova Scotia, my pink cock frequently poking out of the slit between my legs, ready for another round of pleasure.

******

I rose to the surface, sometime later, regarding my colleagues through my relatively dim eyesight. I knew they would soon start the program that would change me back to human, the weak form I once had. Part of me still wanted to remain in this powerful body, to live my life in the ocean realm where I had been an apex being. But I knew deep down I had human responsibilities. Still, if I cooperated with their investigations, I might be allowed to explore once more, in this form or perhaps even another. Maybe next time as a shark? I smiled at the infinite possibilities.