Making one last check to see that nobody was watching, Mary picks up the nozzle of the air machine and ponders where to place it.
"I don't really want to put it into my mouth... I don't know where it's been," she mused. "And there's always..." She blushes. "Nah..." She then looked down past her breasts to her navel. "Could it actually work?"
She inserts the nozzle into her belly button and experimentally depresses the handle. A short burst of cool air flows into her, making her shiver excitedly as she feels it swirl around.
"Ooh, this will be fun!" she says, squeezing the handle down all the way. She notices some inches being added to her height such as last time, but suddenly the upward growth stops and belly begins to expand faster.
"Oh?!" she squeaks, then lets out a chuckle. "Why not?" She keeps the nozel in, her hand moving outward with her stomach.
As her belly reaches the point where she looks pregnant with, well... a litter now, Mary feeels air seep into her lowest set of breasts. She squeals with delight as they begin expanding, shortly followed by the next set, and finally her original.
"I can't wait to see what I'll look like, if I'm able to see anything over these!" she laughs, causing her breasts to bob. "I guess I better go find a mir-oh!"
The air unexpectedly flows into Mary's feet, making her lose balance as they inflate. It's just enough to cause the mass of her ballooning belly to pull her forward as her hand flies free of the nozzle. To her horror, she still feels the air flowing into her!
"Oh no, the handle must still be down!" she cries, but as she struggles to reach around her breasts and pull the house out from under her, her swelling belly slowly lifts the hose away from her grasp. She kicks and struggle to stand, but her bloated feet and legs refuse to respond well, and soon they are lifted off the ground as well. Mary can only whimper as she turns into an orange-striped blimp, her belly the size of a small car and her breasts swollen to beach ball proportions. Her round limbs and paws flail helplessly as her tail, now extending straight out, bobs behind her. As her body begins to squeak in protest, there are no signs of her inflation stopping...