I enter the bed room and close the door behind me. I leave my beer on a near by table and sit to the edge of the bet to collect myself.
The sight of Abby pleasuring herself, her massive horse cock glistening with pre-cum, and her hips moving rhythmically was seared into my mind. I couldn't unsee it, nor did I want to. The warmth and closeness we shared as siblings felt distant now, replaced by a raw, primal desire.
I take a deep breath, trying to shake off the fog of lust that had settled over me. I shake my head, trying to clear my thoughts. "I need a drink..." I say to myself. I stand up and try to make my way back to my beer. I forgot to open the lights of the room, so I can't see much of anything. I stumble a bit, trying to walk straight, but I'm not feeling very coordinated. Maybe I've had one too many beers, I thought. I reach for the table where I left my beer, but I miss it and end up grabbing something else. I look at my hand, and I see that I've grabbed a bottle of some weird, green liquid. It looks like some kind of freaky energy drink or something.
"What the hell is this?" I say out loud to myself. It's not my beer, but I'm curious, so I unscrew the top and take a swig. It tastes sweet and tangy, like a tropical fruit punch, but with an underlying bitterness. Not bad, I think to myself, taking another sip and another one, until the bottle is empty.
Suddenly, I feel a strange warmth spreading through my body, starting from my stomach and radiating outwards. It's not unpleasant, but it's definitely... different. I feel a tingling sensation in my extremities, like pins and needles, but all over. I shake my hands, trying to dispel the feeling, but it only intensifies.
I look down at my body and gasp. My hands are changing, growing larger and more... equine. My fingers are elongating, my nails turning into small hooves. The tingling sensation is moving up my arms, my shoulders, my neck. My legs are shacking, I fall down on the bed unable to move. I can feel my legs and see them reshaping into a digitigrade shape. They're getting longer, bigger and thick. My feet are turning into large hooves, some fur start to speed and longer hair, like feathering, grows just over the hooves.
"What the fuck is happening?" I cry out, panic setting in as I realize that I'm not just drunk, but something else is happening to me. I try to stand up, but my legs are too wobbly and uncoordinated. I fall back onto the bed, my heart pounding in my chest.
I can feel my body changing shape, growing taller. My spine is stretching, my neck elongating. I can feel a strange sensation in my groin, a tightening, a pressure. I look down and see that my jeans are stretching, the fabric straining against my hips and my butt getting thicker and wide. I feel and hear my T-shirt is ripping apart , unable to contain my growing physique. My torso is expanding, my rib cage widening, and I can feel my chest getting heavier. In the darkness, I see my skin getting furry, a brown short fur spreads from my hooves to my neck.
I can feel my ears growing longer and also furry, like a horse's ears. I can feel my muscles growing, I can feel my bones breaking and rearranging. The change is not painful, it's more like an intense, strange, heat spreading through me. My neck gets longer and thicker, my legs get stronger, I feel like I'm growing taller and taller.
At the base of my spine, I feel something pushing out , growing. I look back and see a tail, with long black fur growing. Under it, I feel my anus swelling, becoming a shiny black puffy donut. I gasp, trying to process what is happening. Then a strange feeling is happening around my groins, my penis fully erected starts to get smaller and smaller, until it starts to fold inside with my balls. In can feel them moving inside, transforming into a womb and ovaries. The outside is reshaping into a labia with thick lips, they are are so swelled, it's sure to be impossible to hide the massive camel toe, my new vagina will create under any pants.
I manage to sit down on the bed, I'm shocked and confuse to see that vagina. Then, my chest start to swell, my nipples are getting hard and start darkening. They are growing in size, the sensation is incredible. I look down and see that my breasts are already as big as basketballs and they are still growing. I try to move my arms and feel the weight of them, and it's amazing, I feel good, I don't relies that my face is elongating and gets bigger. My nose and my mouth fuse into a horse muzzle, a mane of thick, long hair spreads from my neck to fall down my back. I feel the weight and the length of it, as I raise my hands back to my breasts and realize they became big as barrels.
I can barely believe it. I feel like I'm a giantess, and I'm struggling just to stand up in the small room. I manage to get to my feet, wobbling slightly on my hoofed legs. I'm a towering figure, at least something like ten feet tall now. I'm not sure what I am anymore, I'm confuse and my head is spinning inside. I look around the room, trying to process what has happened to me.
I manage to find the light switch and I make my way to the nearby mirror. I stare at my reflection, trying to process the changes I see. A tall, muscular anthropomorphic Clydesdale mare stares back at me, her coat a shiny brown, her mane a thick cascade of black hair. Her eyes are green, large and expressive, with long, dark lashes. Her breasts are enormous, hanging heavily firm and invitingly, her nipples dark and erect. Her body is powerful and strong, her hips wide and curvaceous, her ass is massive, round and firm. Between her thighs, her labia is swollen and glistening, her clit visibly throbbing with need. Her legs are long, gorgeous and powerful, ending with some feathering black fur, covering haft of her large black hooves. Her tail swishing lazily behind her.
I can't help but run my hands over my new form, feeling the smooth, firm muscles, the soft, velvety fur. I let out a soft whinny, a sound that is both alien and familiar. I'm no longer human, even male. I'm... I'm a mare. A goddamn sexy mare.
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