Three

It had all happened so quickly. Nicole had been walking home from work when all of a sudden a gang of women in black catsuits burst from a nearby building and dragged her inside, kicking and screaming, into the back room. Waiting for her was another woman - a dominatrix - wearing a leather corset and holding a bicycle pump. As the other women held Nicole down the dominatrix forced the nozzle into Nicole's mouth and began pumping, filling her with more and more air, her clothing tearing off of her as she swelled larger and larger until all that was left of her formerly svelte figure was an enormous ball, her skin stretched to an uncomfortable tightness as she sat there, immobile save for the futile flapping of her hands and feet. Even her face had swollen, her full lips holding the nozzle firmly in place.

The dominatrix waved towards the door, and the catsuited women left without a word. Once they were gone she looked over Nicole and purred, "oh my, just look at you." She pressed a finger into her side, Nicole's skin barely giving. "So full of air. Why, there's hardly any give to you at all." She tapped a finger on her chin, looking pensive. "Maybe I should deflate you..." A devilish smirk then crossed her face and she drummed her nails against Nicole. "...or I could pop you instead."

Nicole's eyes widened and she let out a muffled protest.

"But I think there might be a lit-tle bit more room in you. So let's play a little game, shall we?" She gently rested her hands on the handle of the pump. "I'll fill you with three more pumps of air. If you can hold it, you're free to go." She raised the pump. "If not..."

The dominatrix slowly pushed down on the handle. Nicole's body let out an audible groan as the air flowed into her, the skin of her belly becoming near-translucent. She felt tight all over - painfully tight - and wondered if she could really hold any more.

"That's one," the dominatrix purred. Licking her lips, she raised the handle. "...and this is two."

The handle went down and Nicole's body groaned again, more loudly this time. Nicole's hands and feet, the last traces of normalcy on her form, suddenly swelled out into spheres topped with fat sausage-like digits. She could feel her body quivering from the strain and she squeezed her eyes shut, willing herself to hold together.

"I really am surprised," the dominatrix said, impressed. "You're a very... resilient girl." She pulled the handle up. "...and after this, all that air will be out of you... one way or the other." She pushed the pump down one final time. "Three."