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You awaken on a stereotypical looking desert island with lucious palm trees and with the sun shining down upon you. You hear the sound of seagulls sqawking in the distance out to sea. Getting up, you recall the previous events. Your ship ran aground during a storm. Although the ship was pretty much intact, the engine was shot and a large hole had been punched out the side of it by a rock. You're defintely not leaving the island for the time being. You gather some supplies and hope for rescue to come. Days turn into weeks and you don't see a single soul. Not even a boat or a plane.

Getting desperate and low on water, you explore the island. Going through a dense forest, you eventually come across an entrance to a cave. You go inside and immediately feel relieved to be in the shade. Following a narrow twisting passage, you emerge into an open area. In the center of the cavern, you see grass growing and sunlight streaming in from a large hole in the roof of the cave. Vines hang from the hole. You know this place must've been undisturbed for 1000's of years. You hear the sound of running water and are immediately reminded of just how thirsty you are. Frantically looking around, you find a small pool of what appeared to be fresh water. Cupping your hands together, you scoop up the water and feel instantly relieved. You scoop up several mouthfuls of water and feel very thankful that you've found this place.

After a while, your stomach rumbles. You feel as though your stomach is tying itself in knots. Your vision begins to blur and your skin tingles intensely. Breathing slowly, you begin to wonder weather drinking from the pool was a good idea. Looking at your reflection in the pool, you find your skin was beginning to discolour to a greyish looking colour. You feel the taste of blood in your mouth. Parting your lips, you're shocked to see your teeth beginning to sharpen!. You jump back in horror breathing hard. You catch sight of your nails as they begin to darkn. You wonder if the water itself was toxic and that this was a twisted hallucination. Suddenly your body is racked with pain. Falling on your knees, you shakily look down at your hands and see that your skin now looked completely grey. With eyes watering, you look on in horror as your middle fingers and ring fingers on both of your hands slowly fuse together with sickly crackling sounds leaving you with three fingers and opposable thumb on both of your hands.

Nervously looking at your hands, you see clumps of hair falling out around you and onto your hands. You quickly look over your forearms and see your body was beginning to reject all your bodyhair as it continues falling out around you.

Screaming out in terror, you see your nails now a dark grey stretching out into claws. You fall onto your back writhing in agony as your body continues to change. The only things keeping you company were your screams reverberating around the cavern along with the un-natural sounds of your body changing. You feel your body beginning to heat up as your muscles all over your body slowly inflate to bodybuilder proportions leaving you with an almighty six pack and abs. You close your eyes hoping whatever was happening to you would just speed up but it's just happening so slowly. It was as if an unknown entity was controlling what was happening to you for its own amusement. On your back thrashing around, your screams become deeper and more guttoral as your voice deepens. You feel pressure in your back as a Dorsal fin slowly pushes its way out of your back. More fin like features grow out from the underneaths of your forearms and on the backs of your calfs.. You feel the changes begin to accelerate as it feels like a series of knifes were cutting out slits into the side of your neck. Unknown to you, it was in fact, gills forming.

Finally after what felt like hours, you feel intense pressure building in your face. You let out another monstrous scream as your face slowly pushes out into a shark-like muzzle with a series of slow cracks. Your ears disappear into the sides of your head leaving small holes behind. With a couple of more cracks across your body, the changes slow as your transformation completes. With a couple of more breaths you lose consciousness, your bodies energy completely used up from the intensity of the transformation.
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Want to do another couple of parts to this one at somepoint to see how "you" come to terms with your transformation ;)