You just can't resist stroking it. With each stroke it raises and hardens, but you realize that your balls have remained the same size and that just your cock had grown.
You go to your room to get the wand, trying not to break anything with your monster cock.
The wand was right where you left it. You think about your wish a bit and then you say it.
"I wish my balls would grow to match my huge cock"
You start feeling your balls twitch and grow. They grew incredibly fast like balloons being filled with water. The experience was so erotic that your whole body felt like it was orgasming. Your balls kept on growing until they reacted the floor.
After they stopped you just layed on top of them panting and moaning in pleasure.
Finally, you feel ready to enjoy your huge manhood.
Suddenly, you fell something...