There you are, head hidden between the thick green leaves of your backyard garden, you can't recall how many hours you've spent with your nose looking for the distinctive acidic smell of the bugs that dwell there.
It's easily the strangest situation you've ever found yourself in. Half a day has passed since your water source was contaminated by some unknown kind of mutagen, and a few hours since you've indulged in a bug-eating frenzy in your own garden. The taste of the insects is intoxicating, and you feel yourself wanting more and more of the strangely captivating flavor.
Now you're digging the ground below you with deep black nails that extend into long claws, the skin brushing against the dirt gains a thick, leathery texture, and starts to crack into what can easily be defined as scales. With your eyes now locking on different targets at the same time, your tongue flickering to take most of the smells around you, and the itching of scales growing around your body, you take notice of the strangeness of it all.
You roll on the ground as the scales grow thicker, denser. Your new thick claws thrash around and crush branches with every sweep like they were twigs. The itching is intense, but something is way more.
Your hunger.
Simple bugs won't suffice you, but thankfully you have enough food in your backyard for now. Not paying attention to your new quadrupedal locomotion, your heavy feet grow wider and wider, the skin firming thick wrinkles, giving you a distinctive pair of feet, a cross between that of a lizard's and a turtle's.
Your hands follow the same pattern, you can feel the bones retracting, but becoming wider with every step. The leathery skin grows over every digit, before your nails expand into long, thick, black claws that dig into the dirt and crawl like a common critter.
Reaching to a counter, you start munching on hotdog buns, meat, anything you can bury your teeth in, all while your face flattens and lengthens into a smooth muzzle. Thick leathery scales force your hair to fall, expanding throughout your entire head, spikes and ridges growing on top of bony protrusions on top of your nose and eyes. Your skull is now vaguely crocodilian, although it's appearance gives you the look of a more primitive, bestial creature than any other reptile we know of.
Your teeth sharpen into vicious fangs as you sink them into the meat and bread you find laying around the tables and counters. Your new carnivorous diet is quite grateful for the leftovers of a past barbeque.
It seems that with every munch, every bite you take you get closer to the ground. Looking to your sides with your wide, heavy head, you realize what's really happening: your arms and legs are retracting, while also widening. They become nearly as wide as your hands and feet, and gain dense, packed muscle that helps you push and crawl through the ground with great ease.
Once you've finished all the remaining food you could find, your body is now that of a short, wide, long creature resembling a crocodile. This is clear when suddenly you feel a bursting sensation in your coccyx, before you're able to turn around and see what's happening, a thick, long, huge tail with ridges and spikes on top bursts from your pants, hitting the ground like a whip and letting out a loud noise accompanied by a dense cloud of dust.
You yowl in surprise, but it sounds more like a deep, sinister growl.
Again, the feeling of hunger takes you over, and you realize how much you've grown too when only a few steps with your stubby legs is enough to reach the window of your kitchen, you seem to take most of the space of the backyard now.
With a strength you didn't know you had, you stand up in your hindlegs, and get a hold of the wall with your frontal claws, just before you burst through the window with your thick, leathery head. You need to feed, and nothing will stop you.
With your neck and your head inside your kitchen, you set your sight on the fridge in front of you, and in a strange display of your new abilities, your jaw unhinges like that of a snake's, and chomps on the metal with it's sharp teeth, piercing it like cardboard. You pick the fridge up with a bit of effort, and push yourself back with the help of your stubby but powerful front legs, bringing the wall down in the process, but allowing you to throw the fridge to the backyard with the momentum.
Like a beast, you run to the fridge and claw on it, opening the doors and revealing it's succulent contents to you. You can't contain yourself as you eat an insane amount of food with your ever growing maw, thousands of sharp teeth shredding everything that finds its way in.
Emptying your kitchen from any food available, you don't notice the massive growth spurt you've been through; when you try to find yourself barely fitting in the room, your wide, huge frame is making the whole house creak and is pushing the walls away.
For anyone else, a giant, crocodilian looking monster, as big as a house, is destroying a solid structure like it's foam. It's thick tail brings down walls; a huge 20 feet long pillar of muscle, spikes, and scales.
It's powerful arm and legs, although short and stubby, display all their might when impacting the ground and causing tremors; the floor denting and forms small craters.
The most disturbing element is it's huge, vicious head. It's shape is similar to that of a salamander or any flat headed amphibian, but it has thick scales, spikes, and thousands upon thousands of giant teeth. On top of them, a pair of relatively tiny eyes, pitch black and completely animal in appearance.
Your mind gets numb as instincts take over… The hunger continues. You must feed and grow. Feed and grow. Continue forever. Your body is aching for more size and power.
Not thinking it twice, you start eating everything around you, drywall, wood, concrete, anything you saw was food for you. With your massive size you can stretch your neck much longer and take chunks of the neighbors houses.
You growl when your body reaches a huge new size, outgrowing your house lot and scratching all houses surrounding yours.
Even in your crawling, crocodilian stance your head reaches your second floor. Your tail stretches for well over 50 feet and bends over rooftops, stretching over rooftops and through a couple of streets.
Your last intelligent thought before becoming an unstoppable apex predator is the realization of how big you are. Knowing you're the biggest predator to ever walk on land fills you with pride, and in your new simple, animalistic mind, this only translates to lust, and the need to dominate.
Lifting yourself up with your powerful hindlegs you hold the roof of your house, making it shake and nearly collapse.
From between your scaly hips, the only thing that can reveal your former human nature is the shape of your manhood.
Giant, leathery balls and a long, still human shaped, but extremely thick and leathery shaft.
An evolutionary vestige, as you're not any reptilian creature, but an alternate evolution for humans, into a massive, huge crocodilian beast.
You thrust your member into your walls, destroying them immediately and speed up with all your might, the ground shakes, the house is reduced to rubbish, and letting out a roar that makes all the windows of the city tremble, you reach your climax and splatter all the street and the houses on front with your thick, yellowish reptile seed.
Rolling on the splattered rubbish that used to be your house, you growl in delight at your new body.