John awkwardly turned to see that he'd just gotten a long dragon tail. It was sticking out over his shorts. Oddly enough, it looked to be made of a thick dark blue latex as he could see just a bit through it. Black scale patterns forming everywhere. The tail was a long thick tube, remaining rigid with gas.
"Oh, very nice, very nice." The balloon seller remarked, admiring John's new tail. "But we're not done yet!" John turned his attention back to the rest of him as the pressure had once again become quite intense. Two more 'floomphs' sounded in John's new fin-like ears, replacing his old ones at the side of his head. The rest of his body had slowly filled with the helium and now strained John's clothes.
John's inflating body was too much for his clothes and they tore cleanly off, revealing a shiny dark blue body with a gold colored underside. A rubbery sheen caught the light, giving John's ballooned body a wet look. John felt the pressure of the gas fatten up his hands into large four-digit paws with large black plastic claws on the fingers. The same happened to his feet. Next, John's face pushed out into a muzzle with large white plastic triangle teeth and his now large eyes changed to a toony black and white style.
Carrie pounced on his still round belly and gave it a huge hug. The air, with no where to go swelled into John's other body parts. He felt pressure again build up. But, this time it evened out his now giant inflated body, making him look muscular.
"Should we finish him off?" The balloon seller asked.
"Yes!" Carrie nearly screamed.
Smiling, the balloon seller turned the helium back on and fed John even more gas. As before, the gas rushed into him, and the pressure increased.
John's height suddenly quintupled, and large plastic rubbery wings quickly grew onto Johns back.
After The shopkeeper turned off the gas, John tried to move his huge body and breathed a sigh of relief when he found that his plastic parts were keeping him from floating away, and that he could still move without much of a problem, although all that gas made him slightly stiff but he figured letting a small amount of gas out would fix this problem.
"What did you do to me?!" John asked.
"I made you a balloon animal!" The shopkeeper said.
"Just great"Said john in annoyed tone of voice,"We were just going to stay for a month. How am I supposed to go back to my world while I'm a parade balloon dragon?"