So you're a kid again. Okay, fine, a teenager. But still!
You're so distracted that you don't even notice something funny happening to the condom. It starts to stretch by itself and expands until it completely covers your shrunken balls. Then it starts growing, like some alien parasite, all over your crotch.
By then, you feel it. You panic, and try to tear it off. Big mistake.
As soon as the latex makes contact with your fingers, part of it attaches to them and starts spreading until your hands are now covered. To your horror, you see that all of fingers merge together, leaving you with three digits on each hand. The goopy stuff continues to spread along your arm, turning your skin into a hairless material that feels like latex to the touch and reflects light.
Then it reaches your torso. In seconds, your chest bulks up, and you can see your biceps getting thicker. You punch yourself in the chest, and it feels like hitting a wall made of solid brick or steel.
Your legs undergo the same transformation. And your feet shrink and morph until they resemble paws, with thick nails that scrape the floor. A long strand sticks out above your rear, becoming a thick tail.
Just as you think the changes are done, the latex suddenly encapsulates your entire head. You feel your face pushing outwards, like a muzzle. Your teeth are sharper and broader, your senses of smell and hearing are incredibly enhanced, and you can see much much farther than you used to.
For a finishing touch, dark hair begins to thinly cover your skin. It acts like a coat of fur, keeping your body warm and regulating the outside temperature.
Somehow, you've become a weird animal-man hybrid. Your voice is now a loud growling sound, so no one can understand you.
You lean forward, finding it pleasurable to walk on your hands and feet, and realize that your joints have adjusted so that you can walk on either four legs or two whenever you feel like it.
And then you see your penis, where it all began. Your cock is now a big, throbbing log with a fat purple tip. It's covered with a blue foreskin, like a dog's, and your balls are now a dark blue and lined with hair.
You feel primal instincts that tell you to eat and drink, piss and shit. So you tear through the cupboard and drink from a large Costco jug of water that you rip open with your fingers. Then you drop to all fours and pee on the floor to mark your territory, then stop briefly to poop right in the center of the rug. Then you settle down.
But something's missing. You need to mate, to release all of the sperm that's built up in your testicles. But how to do that?