You decide to test getting a new sample, and you have a bright idea. You take the device and get on a bus. However, instead of going home, you'll go to a municipal park not far away. The park has a tar pit, and you know you might find some interesting DNA samples there.
The park is open and empty, so you don't have to worry about getting caught. Once there, you approach the pits, and the light on the device turns on. "Bingo!" you exclaim as you point the scanner at the tar. After a few seconds, you can see the image of a strand of DNA appear on screen, however, the name and species displayed is listed as "unknown".
You don't mind much as you just wanna try if the device can do what it says it can do, so you open up the "splicing" menu and select "modify user DNA".
You then adjust the settings:
Change to: 50% human, 50% [unknown].
Once everything is ready, you press the start button.
Immediately, you feel a constriction all over your body, and you drop the device as you clutch your body.
You feel a stretching all over as you feel your chest barrel outwards, gaining massive bulk and size, and an insane amount of dense, defined muscles.
Your pectorals and abs feel like they're burning, and they soon plump outwards, gaining beefiness.
You spread your arms outwards as they feel like they're stretching, you soon gain bulk and boxiness all over your biceps, shoulders and forearms.
You fall to the ground as your stance suddenly changes. You manage to sink your hands, which have grown sharp, thick black nails and are reforming into some kind of humanoid paws in the ground as you feel your legs lengthening. They gain the same level of bulkiness as your arms, even slightly more, as your thighs and hips thicken, matching the wideness of your shoulders.
Your legs adopt a digitigrade structure as your feet expand into huge, vicious paws, with long claws leaving marks on the pavement beneath you.
Your skin feels itchy, as coarse fur starts poking out of it. After a few seconds, you're covered in a rough, tan coating of hair.
You clutch your head with your new huge, massive paws. Each one is big enough to hold a watermelon like a soft ball, and they can't do much as you feel your nose and mouth merge together, expanding into a wide, strong muzzle while your jaw muscles become defined and extremely powerful. Your ears raise to the top as they become triangular and sharp.
Your nose wetters, and your clench your teeth as they sharpen and become dangerous fangs.
Your eyes widen, gaining a golden color as you feel a sharp pain in your teeth. A pair of frontal fangs become huge and expand downwards, past your lower jaw, giving you an intimidating, ferocious appearance.
You gain even more bulk and increase in size. You stomp with one of your paws, leaving a crack on the pavement as you now weigh over a thousand pounds, and your height reaches 3/4 of the street lights around you.
With one of your huge, meaty paws you grope your chest as your nipples puff out and thicken, and with the other paw, you rub a developing sheath between your thickening thighs.
The pleasure is unbelievable as you feel a huge, throbbing thorny cock expand outwards, as long as you were tall before your transformation.
Once your head and neck thicken into their definitive feline form, you let out a massive roar as you feel your heavy balls drop.
You wrap your surprisingly soft paws around your shaft and thrust forwards, imagining yourself mounting a strong female sabertooth.
You let out another feline roar as you finally orgasm, splattering your musky mutant cum all over the place, coating the ground with your seed.
You sit down and pant.
Now you're sure it works.