"River Horse" - Hippopotamus Transformation Story (Patreon)

Man into Female Hippopotamus Transformation Story

I’m regretting not listening to the guide – I think in a rush of adrenaline as I’m running from a hippopotamus. I’m chased by a territorial animal in its own environment. That’s what I get for being overly curious and wanting to make more photos in a risky way. I stumble as I run in panic, surprised by the speed of the angered animal. I should have been more careful. How did I even turn the flash on accidentally?! Whatever, I hope I can get out of here alive, no matter the price! I lost my photographic equipment and the hat anyway… Couldn’t be any worse.

I run into the nearby tall grass field nearby the river. As I do I glance behind me and notice that the hippo is gone. Maybe it lost my track or maybe it given up on me. I rest my hands on my knees and pant exhausted of running for what felt like an hour at least, even though it surely was a shorter span of time. I’m sweating profusely even though I’ve stopped running, I feel that I’m continuously dripping. My clothes are stained with aforementioned sweat, dirt and who knows what else. I look around to make sure that no dangerous animals are nearby and I decide I’ll at least wash the clothes in the river. Not just because they’re dirty, I’m in wilderness – Who cares? But I feel like its so hot around here, wind isn’t blowing. I’ll feel better with cool, wet clothes on me during such heat. I look around again to make sure I’m safe and start undressing.

I wash my clothes thoroughly because I can’t look at how dirty they are. It’s really weird, I feel like my body is getting fatigued really easily, even though I’m not doing anything exhausting. I occasionally glance down at my naked body as I feel weird sensations coming from it. I could swear my skin looks weirdly smooth and yet it feels heavier for some reason, as if it started growing thicker. I’m starting to worry that I might have had a stroke or something when I see my sweat starting to change colour to orange-red… My skin is also starting to look darker and my silhouette appears fatter as I stare down at it. I shake my head and focus on my main task – The clothes. Soon I’m done with washing them and I deem them worthy of wearing and cold enough.

I’m about to start dressing up, but the sensations in my body are getting increasingly distracting. My entire body aches and I could swear I’m gaining more mass, not just in my… My thickening hide, but in general. I’m slowly becoming more bulky in appearance as my torso swells and becomes rounder. I blush as I stare down at my cock and realise I’m getting erect. I should worry about my shifting form, but I feel weirdly aroused by my blubbery hide and increasing body mass. I’m about to stroke my cock and just relief the tension, but that’s when I notice my hands looking very bizarre. They look stumpy and my fingers are less dexterous. I try to move them, but instead they move on they own as they thicken. My thumbs get painfully absorbed by my swelling hands and I’m left with four thickening digits with swelling out nails. My heart skips a beat. “This isn’t hot at all… Somebody h-help…!” I scream out pathetically as I stare at my morphing hands that don’t even look human. Similar pain hits my feet and I sit down on my fattening butt to observe the bizarre changes better. My feet painfully elongate a bit and they grow thicker in appearance, forcing me to stay on their balls nonetheless. My big toes shrivel down to nothing as the rest of my digits thickens along with the toenails. Slowly what were my feet form pillar like extremities to support my growing weight. My nails darken and my extremities get covered with grey hide that slowly covers my entire body.

As I observe the changes that stripped me of my hands I can’t help, but bring my attention to my cock. It feels like the only positive of this grim situation. As if on cue my manhood starts twitching. Heat hits it along with my balls and I feel like the changes are stimulating the pleasure in my genitals. “Wait, no!” I grunt as I feel my cock start to change its texture, my ballsack similarly. The wrinkles on my ballsack disappear and my scrotum gets painfully taut, pushing my balls into me. At the same time a nauseating pressure forms in my genitals as they slowly start to migrate further from my sight. I shudder as they travel from between my thickening legs all the way to my butthole to rest underneath it. I’m getting really worried, I clumsily try to stand up, but it proves futile. My weight is too much to bear on my shifting hindlegs alone, so I stand up onto all fours instead. I pant terrified. “Since when are m-male genitals located- Oh God… Nonono…!” I mutter as I feel a suction intensify in my taut ballsack until with a wet plop my testicle shoots inside me. “Aaahn! Oh f-fhuckhnnn…” I groan as I feel my remaining testicle get pulled inside of me. That initiates their transformation into my ovaries – I feel the warmth of my changing reproductive system in my widening lower abdomen. Worse yet, I feel like something is burrowing inside me. A sensation I’ve never experienced before, a tube, a tunnel is forming inside of me and I feel it taking shape making my fattening limbs tremble in bliss. I crane down my neck and try to spot my member, the sight proves to be troubling. I see a tip of my painfully erect cock slowly disappearing from my sight as my entire shaft shrinks and pulls closer towards my empty, yet bizarrely sensitive scrotum. I moan as a wave of heat washes over my groin and I unwillingly come. My dwindling member spurts out a lot of semen that my body will never produce again. I stomp from limbs to limbs as my cock finishes coming, but the heat doesn’t stop. It centres around my scrotum. I feel it changing texture, becoming reminiscent of latex if not for the grey colour. “Naaaaaaa-aaaaaghn…!” I scream out as I feel my scrotum splitting down the middle and opening up to reveal my forming vagina. I feel my new feminity thicken, puff out and become distinctly animalistic. It opened just in time for my cock to shrink down to practically nothing, whatever remains of it is sucked inside my hot cunt and slowly morphs into a clitoris. I pant as I feel the alien, yet exhilarating emptiness, an opening twitch beneath my butthole – My newly formed pussy.

I wish I could turn my body enough to see it, but it’s not possible as of now - The transformation barely begun. I already felt fat since the strange metamorphosis started working on my body a while ago, now the sensations are doubled as I feel my torso barrelling out. My limbs become even less rotary and bendable as they painfully contract and shorten. My entire body grows big, but what used to be my arms and legs becomes disproportionately smaller. And yet I feel like my limbs gain new muscles as the bones in them crack and bend into more stout shapes. I try to turn my head to the side and see how my lower body changes, but its not easy with my torso becoming so wide and massive.

I still feel too well as my buttocks inflate to such extent that the groove between my buttocks slowly disappears. My butthole is pushed out and forced into a more exposed position, making me blush from the humiliation. My rump is becoming a large round blob of very thick skin and fat underneath it. I feel a twinge in my tailbone, followed by unpleasant sensations of my vertebrae popping and duplicating. I see with my mind’s eye how a fat bump pushes out above my massive ass. My tail pushes out some more pulling the flesh and forming a distinctly triangular tail. Its tip lengthens some more and forms a tuft of hair at the end. One upside of the growth of my tail is that now my shameful openings are at least somewhat covered…

As my body gains even more mass going from statistical male human weight to unbelievable at least 1500 kilos the remaining contours of my humanity get washed away by my thickening hide. “Gh-Shiiii-Iiiit…” I exclaim in pain as I feel my lower body skeleton remold into thicker and denser shapes. My pelvis widens and my hips lock into a quadrupedal stance, reorienting my hind legs in the process. My legs are by now indistinguishable from a natural hippo’s hind legs – A pair of fat, stumpy pillars.

Meanwhile the grey hide starts to contaminate my upper body. I feel my ribcage crack violently as it expands into a massive and longer shape to accommodate my round barrel-like body. My insides churn and reorganise as they change shapes and grow bigger. My back broadens and smoothens when the fat and thick hide fill the crevices. My shoulder blades grow thicker and bend to force my front legs to permanently remain on the ground. I feel pinches on my chest as the remnants of my human nipples get pulled all the way down to between my strong hind legs. My eyes widen as I feel my previously flat nipples start to sag down a bit and form hippo teats - Two somewhat sensitive mounds of fat. I can’t comprehend that I’m actually becoming a female animal, this day feels like a fever dream to me. I feel like I should just endure the changes at this point.

My neck starts to bloat with fat, forming folds of skin as too much mass stores underneath. I feel that my neck is becoming less bendable as it starts to shift. I grimace as the base of my neck thickens and snaps into a quadrupedal adapted formation. I close my eyes as my head starts to drift further away from my continuously growing torso. My neck lengthens as new vertebrae form and widens to fit my huge body. Before I have a chance to sigh I feel a tremendous headache invade my skull.

I open my mouth trying to scream, but what comes out sounds like a bizarre bellow of distress. My skull grows huge and everything on it repositions. My eye sockets are getting pushed away from each other and my eyes migrate to the sides of my growing head. I shut my eyes as they hurt and swell larger. I feel like they’re about to pop out of their sockets as they bulge out, but the sensations finally stop. My pupils sting as they shrink and become stretched into more horizontal shapes, in the meantime my irises become an intensive hazel colour. As my eyes open again I feel confused, my sight is so different and each of my eyes faces a different direction. My head grows what feels like wrinkles, but they swell and form folds of thick skin reminiscent of what’s on the rest of my body. The forming hide wipes out the clumps of my human hair off my shifting head. My human ears contort and drastically change shapes to be fit for my future amphibian life. I feel like my ears fold onto themselves as they stretch longer. I feel them becoming more rotary and I instinctively wiggle my ears as they finish changing. My forehead is flattening and my entire head is sloping down making me roar in pain. Finally my enormous head calms down, leaving one main area to change yet.

I shake my head in protest, but the changes went too far already to give up on me. A huge pressure hit my jaws as my face started reshaping. I see my nose widening and swelling, becoming huge as my nostrils are painfully forced to migrate on top of my forming snout. My jaws tense up until the pressure is released and they shoot outwards. They creak and snap as they elongate and grow wider at the same time forming an intimidating hippopotamus’ muzzle. My mouth is widened in the process becoming a gaping maw as my muzzle finally finishes growing. In my field of vision rests a huge broad and powerful muzzle. In it my tongue stretches longer to fit inside better. My muzzle’s shape is formed, but my maw isn’t done changing. I feel my gums start to ache as they begin to fuse with my lips. The change forces my human teeth to loosen and fall out of my shaking maw, preparing it for what’s to come. I spit out my old teeth, somehow more terrified that they fallen out than I was scared of turning into an animal. My worries are soon soothed by tough spikes piercing my aching gums. In my inner maw I feel rows of tough and broad teeth forming and growing out. While the aforementioned spikes and most painful sensations hit my outer maw. Many sharp and long incisors slowly push out of my gums stretching them wide. Slowly many irregular fangs finish growing, except two of them. Two canines continue to erupt from my lower outer maw, they are bigger and stronger than the rest of my dentition I realise with self-respect for my new body. The last changes hit my head as it gets fully covered with the grey slimy hide.

My entire body grows some more, I see the plants around me getting even smaller. I’m massive at this point and feel the last changes finish transforming me into a… Female hippopotamus, now that I’m reminded of it. I am afraid of what I turned into, but I try to think rationally about my situation. I try to turn my head enough to see my swollen, round sides and I manage to. I see that my hide leaks a weird looking fluid and then I realise one thing that I’ve read in Wikipedia. The fluid is produced to protect me from the scorching sun supposedly and the orange-red substance is neither blood nor sweat. The more I know… Well, back to contemplating my new existence and reality.

I turn around trying to bend enough to examine my lower body, but that’s when I notice a peculiar sight. A hippopotamus stands behind me, the same one that I ran away from. Well at least he shou- - I think to myself, but the animal rapidly rushed towards me catching me off guard. Please don’t hurt me! – I try to scream, but it comes out as a low croaking sound. The animal doesn’t seem hostile, but it sure seems eager to do something. Before I have time to think about it, it suddenly jumps onto its hindlegs for a few short seconds to reveal his erect manhood – That’s when I understood. His upper body suddenly lands on mine and I feel his huge, blubbery weight on top of me. I timidly bellow as my tail instinctively rises and reveals my needy cunt to the male. His eyes shine and he hits the spot as if he did it many times before. I moan in low sounds as he slowly pushes his sharp cock tip into me. I feel like its too big for my swollen cunt, but he seems to knows better and pushes further, making me shudder in bliss as his unique cock rubs my thick walls. Slowly he finally pushes his entire length into me and I feel like I’m being stuffed – It’s a completely new sensation to me, to be fucked, even more so by an actual hippo. The fucking began just now as the male, despite his 3500 kilos weight started energetically pounding my pussy. He kept thrusting his plump hips to stimulate both of us. My short tail wiggles with each thrust, I feel like my walls are clamping on his cock and it only motivates him to do better. I pant and moan in guttural voice as the male grunts behind me. The heat in my big groin rises, I feel like lust is cumulating inside me. I help the male and sway my huge bum. Soon my legs feel like jelly as my fresh pussy starts contracting and I feel like its too much for me. I’m coming!!! – I want to scream out in ecstasy, but instead bellow at the top of my lungs signalling to the entire environment how well I was fucked. The male nudges me with his muzzle and I feel his cock starting to pulsate in my tight cunt and start to spurt out massive loads of cum, worthy of the species’ size. We both pant for a moment. I notice him calming down, but my own orgasm is surprisingly long lasting and my entire body feels limp as the pleasure washes over me in many waves. The male pulls out and the mixed juices gush out of my cunt making me sigh with relief as the tension disappears.

The male rubs his snout against my side and signals to me to go with him. I look at my clothes lying at the riverside and sigh. I suppose that’s my best option now. Maybe when I’ll learn to live in this body there will be a possibility to turn back some way, or maybe not. I groan and follow the male into my new life.