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My friend Darrel was a weird guy. I never really knew what he was up to. But he always helped me; helped me get through school, helped me discover my true sexuality, helped me with getting a job. Whatever I needed, he somehow managed to help me with it.

We have gotten quite close because of this. I would be lying if I said I'd never fooled around with him.

But after some time of doing so, I still wasn't fully satisfied, like there was something missing. I obviously told Darrel about it and he more or less surprisingly asked me a bunch of very specific questions; asking me which gender I'm most comfortable with, how many people I'd like engaged, which genitalia I'd like to have, where I feel the most aroused, and many more.

Mysteriously, he actually came to a conclusion; "You want to be a shark."

"What?!" I looked at him, dead serious.

"Yeah, all your descriptions of being aroused in the water, preferring two dicks, loving animals...You want to be a shark!" He explained seriously.

"Okay, let's say I did want that...How could I possibly become a shark?" I asked him, perplexed.

He offered me a mischievous smile.

I looked at him wide eyed, "You're kidding, right? You couldn't possibly help me with that as well?!"

Darrel just nodded, a wide grin still on his face.

---

After getting more honest with me, he explained that his dad made special potions that could hybridize humans into certain animals. It was a big secret, and some potions were still in development, but a certain shark potion was supposedly already finished. After all this time knowing Darrel, I still wanted to question his whole family's existence and how all of this was supposed to be possible, but I decided against it to save myself from a headache, the thought of becoming a shark hybrid surprisingly made me pretty horny already.

Later that day, he had actually managed to set me up with it, carefully explaining how the transformation process worked, and getting me to sign a few papers so his dad wouldn't end up in jail.

One of the main requirements for the potion to work was to be underwater, so he and I quickly headed off to our local swimming pool since they offered a 10 meter deep pool which was quite empty most of the time, perfect for the transformation.

---

After getting in the water, I grabbed hold of the ladder and took a couple of deep breaths, pulling myself down, until I eventually got down to the bottom of the deep pool. The pressure on my full lungs was really uncomfortable at this point, and I had trouble holding my air in, but if I was honest, I'd always liked this fact, causing a slight dent to form in my swimming trunks, being thankful for the fact that nobody could notice so far down.

Just as expected, when the stopwatch on my arm showed one minute having passed, my lungs beginning to ache from the building carbon dioxide, I injected the serum into my lower arm, the process causing a few air bubbles to escape from my mouth, but I was grateful having managed this essential part.

The instructions said, that for the transformation to take place, one must stay underwater for at least three minutes, because otherwise, the body would just retract the serum, which it couldn't do as long as I was holding my breath.

This was an insane task at hand, given I'd never been able to hold my breath for longer than two and a half minutes, and that was under controlled environments, but I reminded myself of the incredible opportunity at stake, trying to calm myself down and my heartbeat as best as I could.

When my stopwatch eventually showed the passing of two minutes, my lungs hurt horribly, my chest spasmed rhythmically, while all my willpower went to prevent myself from resurfacing. The insane feeling of my lungs hurting so bad, and me holding my breath for so long caused my cock to get fully erect, urging me to remove my trunks to release the strain they caused on it.

The moment my trunks were off, my shaft sprang to life, an intense sensation of sexual pleasure rolling through my entire body, whilst my lungs still hurt indescribably bad. I knew starting to masturbate would allow me to hold my breath longer, so I took my hard seven inches in my hand and began rubbing, the prior wave of pleasure running through my body yet again.

My clock now showed 2:45. I had never held my breath for so long, the insane feeling of my lungs, whilst my chest spasmed wildly and my heartbeat slowed with every beat, was something I could never put into words; it just felt incredible.

Being deprived of oxygen is just something you cannot put into words; you just have to experience it; and I did in that very moment.

At this point, I knew I'd make it to the three minute mark, but my body was still insanely worried about drowning.

And then, it finally was time. Just when I thought I couldn't hold it any longer, being deprived of oxygen for three minutes, I instinctively opened my mouth and sucked in a deep breath of water. My lungs instantly filled with water and I thought I'd be coughing, but I didn't. A few seconds passed with my lungs burning even more than they had already done, but during these few seconds, a series of transformations occurred, one of them being the development of gills. And when they finally finished growing, the water from my lungs was redirected to my new gills, absorbing the oxygen out of the water and supplying it to my body, finally getting oxygen again after over three minutes.

Were it not for my gills I'd have drowned by now, but instead, my gills perfectly worked in tandem, constantly absorbing the oxygen out of the water and supplying it my bloodstream.

I couldn't believe I was actually 'breathing' water, being 10 meters under the surface for over five minutes without feeling any discomfort. It actually felt like I was normally breathing air, but I wasn't.

I used this to calmly swim around the ground, swimming lanes with ease, turning around to look at the distant surface, seeing the 10 meters of heavy water above me, my time underwater getting longer and longer.

I felt like I'd never need to resurface ever again, my incredible gills easily enabling me to stay underwater for as long as I'd like, and that without any equipment. To prove matters; I was completely naked! Which reminded me of my arching dick, but when I looked down, I instantly stopped in shock. Where a few moments ago, my seven inch human cock had been, were now two massive shark cocks squirting a line of precum into the water with need, begging to get attention.

I obviously didn't deny them that, and quickly went into a sitting position on the floor, grabbing both of them in my big paw, grinding them against one another, and squeezing them up and down. The pleasure that filled my brain was indescribable, feeling that kind of sexual pleasure whilst being completely underwater without being disrupted by the burning of my lungs was just incredible!

I guessed them to be at least one foot in size, but it could've also been two, the water bending my sight. I took my free left paw to explore the gigantic ball sack hanging right below my two monsters, feeling two heavy coconut-sized balls rolling around in my palm. My balls were massive! But it made sense, given how much seed two gigantic cocks were able to release, the thick tubes running along the underside of them clearly evidencing just how much they were able to release. The size of my cock 'tubes' more equal to a big fire hose than to a garden hose.

I continued caressing my heavy balls, running my fingers in between them, exploring every little detail of them, given I had no need to hurry, even though, at this point, I was underwater for 10 minutes.

The fast rubbing of my cocks caused me to pant heavily, this kind of sexual pleasure requiring a lot of oxygen. But my powerful gills had no problem at all in providing it to me, proving to me once again that I could basically stay underwater forever, probably even sleep like this!

Only if my friends wanted to visit, they could only stay for a minute or two at a time, but I guessed my powerful gills were probably producing excessive oxygen, allowing me to supply my friends with air by blowing the excess from my lungs into their mouths, proofing my power to be even greater than I'd already thought.

But when my left hand suddenly slipped downwards, I noticed something even more insane; I had a pussy! Darrel apparently forgot to tell me this was a side effect of the gender mixed shark DNA used to make the serum.

The tips of my fingers were now embraced in my warm folds, the shock instantly resulting in me pulling out, but when I realized what it was, I didn't hesitate any longer and quickly went to explore it as well.

My left fingertip gently brushed along my pussy's engorged clit, a deep purr suddenly vibrating through my body. I then pushed two fingers in, swirling around, the even newer sensation nearly causing my cocks to spray their loads. The shear warmth and texture around my fingers was so inviting, drawing them deeper into the giant depths of my mighty pussy. I added the rest of my fingers as well, eventually realizing just how big it was as my whole hand was inside, allowing for the perfect exploration of its inside, eventually finding my G-Spot. When my hand brushed along it, I felt how my strong pussy walls clenched around my whole hand and arm, trying to squeeze seed out of it.

This gave my incredibly horny mind an idea; If my pussy wants seed, why don't I give it some?

I quickly stopped rubbing my twin cocks and pulled my hand out of my cunt, sad for a moment by the lost stimulation. I then proceeded by aiming my twin cocks towards my entrance, spreading my coconut balls to the side for better access. When my sensitive tips brushed along my equally sensitive clit, I nearly lost it, but I somehow managed to hold on. I eventually managed to insert more and more of my flesh into my cunt, the warmth of my hard cocks in my pussy, and the warmth of my folds around my sensitive cocks being something from a whole other world. After a bit of adjusting, I managed to get almost my entire lengths in, the tips now brushing against my G-Spot, as if my womb were made for my cocks. I began continuously flexing them, whilst pushing them in and out with my paw, stimulating my sexes beyond belief, the fact they had already been close to orgasm resulting in me quickly losing my mind.

My hefty balls tightened up, gallons of hot cream quickly getting pumped through the long hard tubes of my cocks to spray right against my G-Spot, the immense amount of hot gunk spraying against it quickly resulting in my pussy orgasming as well, my walls squeezing and rippling around my cocks with brutal force, milking every last drop out of them, as if begging to be filled. I felt the immense warmth inside of me spread, my belly beginning to bulge due to the shear amount of cum getting pumped into my belly, making me envy I didn't even get a taste sample.

---

After I had calmed down from my insane orgasms, my body consuming excessively much oxygen which my gills gladly provided, I saw Darrel swimming down to me, the look on his face being unmistakable.

I saw his face blushed as he lay eyes on my twin cocks, his own one quickly forming an unmissable tent in his tight speedo.

After getting closer to me, he quickly noticed my massive physique, gigantic muscles having formed on my entire body, enticing him to touch me. When he pressed his right hand against my bulbous pectorals a big gush of air left his mouth, the contact with such incredibly hard muscles apparently having completely overwhelmed him.

He signaled having to go back up to get some air, but I grabbed his arm, trying to signal him with my webbed paws that I could supply him with some, telling him to kiss me. The look he gave me was worrisome, but he trusted me, swimming closer to press his lips up against mine. I opened my lips a little bit at the point where his met mine, and let the excessive oxygen my gills pumped into my lungs flow into his mouth.

I watched him deeply inhale my air, his face once again telling me he couldn't believe this was happening.

Thankful not having to leave me to get air, he embraced me in a tight hug, nearly causing his newly gathered air to escape again, but he just about managed to hold on. After parting again, he couldn't keep himself from running his hands along my valleys of abdominals, me just noticing right now how defined they were, even some thick veins running across the hardened mounds. I deeply enjoyed the feeling of his fingertips gliding between my ridges, a few fingertips occasionally pressing against the hills just to test how hard they were, I flexed them for added effect.

When his fingers ended at the lowest of my abdominals, he continued his journey by taking one of my cocks into his hand, my cock instantly spasming and hardening from the contact, letting his hand look tiny in comparison to my growing spire.

Just as my abdominals, my cocks were ridiculously well defined and rock hard, greatly satisfying Darrel, especially when a big spurt of precum eventually spurted from my tip.

I saw him wanting to take my other cock into his left hand as well, but he had apparently run out of oxygen again, reminding me just how powerful I was by not needing to surface at all. He went over to my snout, smiling at me, before exhaling all of his used up air. He then pressed his lips against mine, and I effortlessly provided him with fresh oxygen that fully filled his lungs.

---

***beginning of optional watersports part***

I thought he would now continue with his explorations, but something was still up. After making a lot of weird hand signals, I finally got it; he needed to pee.

I didn't want him to leave, enjoying his company too much, and something inside me urged me to do something insane, so I signaled him to relief himself in me.

I loved the shocked look of his face, not believing he had understood me right, but I indeed wanted him to relief his bladder in me, already opening my mouth up wide.

His straining bladder forced him to just go along with whatever would relief its pressure, Darrel quickly pulling down his speedo to reveal his all too familiar shaft to me.

Now completely naked, his shaft swirling in the water, he swam over to me, positioning his cock over my open mouth. I grabbed hold of his hips with my strong arms, and lined him up, his sizeable meet now inside my maw, closing it around him, careful not to hurt him with my sharp teeth. When I was ready, I signaled him to start, and to my surprise, he actually did, his lovely cock quickly beginning to spray his pent up urine into my big muzzle, his lovely taste coating my entire tongue, slowly filling me up.

When my maw was completely full, I gulped his piss down, its warmth quickly spreading throughout my body, my brain loving the fact I was supplying such an intimate service. His lovely cock continued releasing his pent up load, his bladder apparently having been quite full, being surrounded by all this water not helping this fact either. I deeply enjoyed his strong stream bathing my tongue, warming my upper body with his essence. I occasionally swirled my tongue around his shaft, testing out how it felt like with my new shark tongue.

When his bladder finally seemed to be empty, the urine stream from his cock coming to a stop, only a few drops falling onto my tongue, I gently pulled him off of me, keeping my lips sealed around his cock to clean it up and prevent any water from filling my mouth, wanting to keep his lovely taste on my tongue as long as possible.

***end of optional watersports part***

---

After once again supplying him with new air, his mischievous smile and stern look at my twin spires told me what he wanted to do. I gave him a pleased nod, and moved him into position, his mouth hovering above my groin whilst his eager meat happily hovered above my snout.

We nearly simultaneously took our malehoods into our maws, Darrel just taking one of my cocks into his mouth since even that was already giving him plenty enough to work with. My body shuddered in delight upon feeling his warm tongue swirl around my sensitive tip, this being the first time one of my shark-cocks got a blowjob. Darrel's own body however reacted quite similarly, a few air bubbles getting released from his mouth, he apparently liked the sensation my big meaty tongue had on his spire. We both were well used to what we like, me using fast motions around his cock, whilst he repeatedly bobbed his head up and down a few of my inches, getting lower with every bob. Once again, I was at a point where I think words can't describe how and what I felt, my new shark-cocks with their added nerves and surface area providing unbelievable sensations to me, ones that are so much stronger to what I'd been used to.

This only got 'worse' when Darrel found my pussy, a few of his fingers quickly ending up inside of it, trying to stimulate me as much as possible, and it worked.

To no one's surprise, it didn't take me long to cum, the intense stimulations to my virgin shaft and pussy being way too much to me, causing my heavy balls to suddenly tighten up, pumping their tremendous load through my long shafts, one part of it landing directly in Darrel's throat, whilst the other one wildly sprayed like a firehose next to him.

My vigorous shaft wildly spasming inside Darrel's throat, nearly drowning him with the amount I produced, whilst his low oxygen levels greatly increased his arousal, caused him to release his own load as well only shortly afterwards.

My own shafts were still releasing their load whilst I happily gulped down Darrel's smaller, but still delicious cream, the feeling of his hard cock spasming against my tongue still delighted me immensely.

When my balls were finally spent, Darrel's stomach now pretty full of my hot essence, I quickly pulled him off of me, knowing full well his body would greatly appreciate new oxygen by now. I once again tried to keep my snout sealed whilst I pulled his spent shaft out of my maw, trying to keep the taste of his delicious cum on my tongue, this fact however also had the effect of the air I provided him having a quite distinct smell of his load, but Darrel didn't complain about this fact.

We ended up cuddling in a warm embrace, looking up at the far surface above us, enjoying our intense afterglow, body warmth, and the shear feeling of being underwater.