Mary gulped down the whole contents of the vial, it tasted like strawberries. She sighed and put the vial back into the box. She placed a hand on her stomach, she was feeling a bit bloated, like having eaten too much pizza and drank too much soda. Suddenly, a loud hiccup escaped her lips, reverberating all through her and jiggling her udder. She blushed and self-consciously put a hand on her mouth. She giggled, the hiccup had relieved the pressure.
Stretching, Mary propped up a couple of pillows on her bed and laid back on them to await the changes, if there were any. Idly playing with her udder, Mary wondered what the inflatable change was to be. Was she going to blow up like a balloon or something? Her fingers pressed into the flesh of the udder, they didn't go in as far, in fact, it was becoming taut. She looked down to her udder, it looked more like a pink balloon now. The long teats were rigid and stuck out from a pert and very round ball of...flesh? No, it was too shiny for that, it reflected the light and as she rubbed her finger over it, it squeaked. Intent on the udder, Mary leaned closer and examined it. While still warm, it didn't feel heavy anymore, it felt light, but very tight. She could press her finger in and only make a small dent, which quickly sprang back.
She could flick her teats and they'd also spring right back, it felt a bit odd. But, a good odd. She fingered a teat and noticed the tip getting hard. As she watched, a nozzle like you'd find on a pool toy grew and poked out. In fact, all her teats had the same feature now. Now, this was a change that was different. Mary was glad she'd chosen it and soon felt the change progress to the rest of her. It was a pressure and made her feel lighter. Her skin turned into something like rubber or latex and was filled with, she assumed, was simple air. Her tail flexed out and took it's shape as a rigid inflatable.
Wow, Mary thought looking at herself, I'm an inflatable cowgirl. Now, what to do with such a body?