You stare in amazement as your junk continues to swell in size with no signs of stopping. Surely there has never been anyone with a cock and balls this big before.
That's when two very important realisations strike you.
First you realise that you never actually stated the cock and balls had to be human, just that yours should be an inch bigger than the "biggest cock and balls ever". What's the biggest creature on the planet? Thoughts race through your head.
"An elephant? A whale? Oh god! How big is a whale's dick?! What if there are creatures even bigger that humans don't know about yet?"
You glance back down at your junk to see the head of your dick now reaching for your ankles while your balls have swolen to the size of large grapefruits.
The second realisation to hit you is that you said you wanted to be an inch bigger than the biggest. If your junk grows in size to be the biggest, it would then have to gain another inch to fulfil the wish, making it bigger still and then be required to gain another inch so on and so on. Your cock and balls were never going to stop growing!
You quickly go to grab the stone again to undo your wish when you remember that new wishes can't undo old wishes! How are you going to fix this now?