The tiny naked Jim jumped outta the shoe, and ran out from under the bed, WHERE HIS GIANT FATHER WAS SITTING.
"Hey, dad!" he yelled! " DAD! I'm down here!"
It just so happened that Ron happened to notice a doll that resembled his son, only realizing that is WAS his son.
"Son?!" Ron exclaimed, in a voice that made his son wince and cover his ears. "What happened to you?!"
ONE EXPLANATION LATER....
"So let me get this straight." Ron said. "This balloon allows you to magically change human bodies." Jim nodded. "And you want me to try and make you bigger." Ron said. Jim nodded.
"Ok." Ron said. "Read me the instructions."
"First," Jim said. "INFLATE THE BALLLOON AND SAY THE SPELL YOU WANT."
"OK." Ron said. He took a deep breath and inflated the balloon. FFFFOOOOOOFFFFF. "Control my son's size," he said.
"Now let the air, bit by bit outta the balloon." Jim said.
He let his grip on the balloon slip ever so slightly. A light hiss escaped. Slowly, but surely, Jim started to grow.
Ron let out more bits of air, a bit at a time. Slowly, but surely, Jim grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew and grew till he was normal sized again. he quickly put his clothing back on again.
"So," Ron asked his son, "What shall we do now?"