"I think I'll try being round." Amy answered.

"I can deal with that." The boy said, grabbing another bubble. He placed the bubble in front of Amy's mouth. "Now just open up and don't inhale."

Amy opened her mouth, allowing the bubble to enter her. The bubble moved down her throat and filled up her body.

Amy pressed her hand against her belly. "I never thought that this was possible."

"You'd be surprised." The boy said as he inserted another bubble. "I've been working on this trick for a few years now."

Amy now looked impossibly huge. "I can see that."

-----

It had been an hour since they started. The boy had been nice enough to release Amy's feet from the cement. Amy had grown much larger, now she was round, just like she asked. The downside was that, with all the internal pressure, her panties had snapped, exposing her butt and her front. Amy was grateful to whatever Powers That Be that the it wasn't loud enough to attract the boy's attention.

"How do you feel?" The boy asked.

"Hmm?"

"Do you want to keep going, or do you feel too full to keep inflating?" The boy asked. "We still have two thirds of the bubbles left."