John awkwardly turned to see that he'd just gotten a tiger tail. It was sticking out over his shorts. Oddly enough, it looked to be made of a thick orange latex as he could see just a bit through it. Black stripes ran jaggedly at intervals. The tail made an S curve, 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 John new tiger ears, standing straight and taut on top 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 orange, black and white body. 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 three-digit paws. The same happened to his feet. Lastly, John's face pushed out into a muzzle.
The balloon seller turned off the gas as John finished his inflation. "Catch him, my girl!" The seller said. Carrie nodded and grabbed John's tail as he'd begun to float lazily upwards.
"Thanks!" Carried said to the seller.
"Ummm...." John asked, regaining a bit of control over his thoughts. "Now, what just happened?"
"Hmmm? Oh! Didn't you see? I make balloon animals!" The seller pointed to a sign and then to the bunch of balloons behind him. Each a rounded and full animal of one type or another. A couple smiled and nodded to the couple below them.
The seller waved goodbye as Carrie, holding John by his tail, hopped away.