The adventures through the magical store continued as Amy stopped at a vending machine. The air was pretty dry inside the old place, and she was getting thirsty. Licking her lips in an odd feline manner, Amy looked at her choices. There were sodas with odd names, and no brands she recognized. The final choice said "Choose Your Own Drink." Curious, Amy inserted a dollar into the machine and pushed that button.
"Thank you for drinking with us today," said a pleasant female voice. "Please state your species for the machine to brew a drink specifically designed for your unique nourishment needs."
"Uh..." Amy said, wondering if she should use the words "human," "cat," or some combination of the two. "I'm...I guess I'm a cat-girl," she said pathetically into the machine. "Sorry, I'm new at this."
She heard the machine whirr and shake. In a minute, a bottle dropped into the dispenser at her knees. It had no label, but the clear plastic showed an opaque white liquid inside. Milk? "I guess cats love milk," she said, unscrewing the cap and sniffing it. It seemed like ordinary milk, and she took a tentative sip. "Mmm!" she licked her lips again. "That's delicious!" Amy greedily chugged the rest of the smooth creamy milk, not caring that she was spilling some down her face. She finished the bottle with a satisfied "Aaaah!" and brushed the excess milk off her lips with a furry arm. She dumped the bottle into a recycling bin next to the vending machine.
"Thanks!" she said happily to the machine before skipping through the store. She was almost at that aisle where she thought Lina might be, and the delicious milk had revitalized her spirits, as if she wasn't already having fun slowly transforming into a cat.
She was just two aisles past the vending machine when her stomach gurgled painfully. "Oh geez," she thought to herself. "I probably shouldn't have been jumping around like that..." She clutched her furry stomach with both arms, unable to stand up straight. She hoped she didn't have cramps too badly.
But to Amy's surprise, the cramps faded rather quickly. It felt like the milk was spreading out of her stomach, but not going where it was supposed to. Her body heated up, the sensation concentrating mostly in her chest. Looking down at her shirt, she saw that her breasts were slowly growing larger. "What the hell?" she stammered, feeling the bra tightening under the strain.
But that wasn't the half of it. More burning brought a hand up to explore underneath the breasts. Her hand felt something else pushing its way out. She frantically felt around her chest as the changes continued. Her breasts were almost numb with heat, but her back was clearly in pain from the tightening bra strap. Leaving the other growing mounds on her chest alone, she thrust her hands up the back of her shirt and struggled to undo the clasp. Before she could succeed, however, the clasp snapped apart on its own. With that problem out of the way, Amy returned to her burning chest. Now she could tell that more breasts were growing out. Her original pair had stopped growing, thankfully, but the burning and enlarging of her shirt told her that the others hadn't. She cupped the furry lumps under her shirt, feeling the soft flesh filling her hands. Finally, the heat died down and the growths stopped.
Amy stood still for a moment, shaking slightly at the change that had just overcome her. She felt something uncomfortable between her breasts and reached underneath her shirt to remove the broken bra. She hadn't had very large breasts compared to most girls in school, but now she definitely had something worth bragging about. They weren't freakishly huge or anything, but it was a definite improvement. However, the others...
Scared at the prospect of these new mammaries, Amy slowly lifted up her shirt and beheld four newly-grown breasts stacked below her first two. These were slightly smaller than the top pair, and the bottom pair seemed the smallest, but they were all quite round and beautiful in their own freakish way. Each one was still coated in white fur and each one had a regular-sized nipple. "Well," she said to herself. "Guess I shouldn't have expected that milk to be normal."