Joce eyed her boyfriend with interest. Peter, despite now steadily filling with air, didn't look like a balloon at all- the wish had made it so each muscle was it's own balloon- but some overworked muscle monster. He was pretty much immobile, with his giant biceps and pectorals keeping his arms practically at 90 degree angles, and his massive thighs and calves keeping his legs splayed out.
In fact, Joce realized the air was being forced to fill Peter's body outwards to make room. His back and shoulders were at least two to three feet thick, and his butt huge slabs of muscle. His pectorals, now boxed in by his arms and chin (there wasn't anything that could really be called a neck- just giant power cables that connected laterally to his shoulders) was forced outwards.
It was currently his abs that were finding any real room to grow... of his body, this might be the only indication of Peter's kin to a balloon. They had barreled out, and could give an impression that Peter would be able to swallow a car! The entire gut stood a good six feet out, only the very top covered by his shirt.
His shirt- Joce realized that it (and his jeans) were now growing with Peter. She must have been distracted by the ballooning figure of her boyfriend to concentrate on keeping them their normal size. After all she did secretly enjoy the idea of Peter reducing the clothes to tatters with his muscle bulk. Maybe she'd see too much of the Hulk reruns as a kid.
Well, it wasn't like this really was muscle, despite the hyper definition Peter now sported, just air...
Suddenly an downright naughty idea enter Joce's head. Why not?
And with a mental wish, the air puffing up Peter became real muscle.
He sank like a stone, crashing to the pavement. He balanced for a moment on his feet, before falling onto his butt. It was so large, however, he stayed propped at a forty five degree angle, since his legs wouldn't bend.
The sidewalk cracked under the massive weight, and his feet had left indentations where he'd landed. He was so heavy!
Peter gasped, and the seams of his jeans gave way a bit further. His shirt creaked under the strain.
he grinned and watched as Joce looked at his body hungrily. "Had your fun, eh?"
"Oh, no. I've only just gotten started..."