The girls walked, or in Amy's case clopped, in the direction of Samantha's apartment. Both Amy and Lina had roommates, and didn't want to expose them to the magic of the store willy-nilly. Thankfully, Samantha effectively lived alone in her apartment, as her other roommate was studying abroad through the Spring Semester and into the Summer.
They were gaggling animatedly over their respective transformations and purchases, excited over the possibilities they offered. The horse girl lagged behind a couple paces, fighting down a pang of discomfort in her stomach. Something I ate? she thought to herself.
"I just love yo-oo-oour hair," cooed Lina, who seemed to be having no discomfort while walking "barefoot" along the sidewalk, "it's soo pre--ee-eetty!"
"Thanks Lina," said Samantha sweetly, running a finger through her pink tresses, "it feels very nice to be so girly honestly. I wasn't sure if I'd like it."
"How much more do yeighoou think you're gonna do?" said Amy, examining the short, brightly colored girl.
"Not sure" said Samantha honestly, as she chewed thoughtfully, "I added a second piece back in the store but I think some of the sweetness is fading a bit. Another few hours and I'll probably start looking more normal again."
"Shtill," she continued, her words coming out thickly as she chewed away in preparation for another bubble, "might asshh well keep going while itshh got shhome juice."
With that, she blew a fair sized bubble and popped it. The pastel beauty dropped another two inches in height to 4'11" without her shoes, her arms windmilling slightly as she fought to keep her balance in her platforms. These too were changing, as the lace and tongue section of the shoes melted away, leaving the top of her feet in her striped socks exposed to the air, while the pink ribbons remain tied in a bow around each ankle. As Samantha regained her balance, white straps crisscrossed each foot in an X pattern, more firmly securing her in the shoes.
Her striped socks lengthened to sit a few inches above her knees, while her skirt extended downward a few inches, losing its pleats and becoming a much softer, flowy garment. Layers of pink frills and lace flumped into place, turning it into a ruffle skirt. It fluttered softly against the ruffles at the tops of her socks before Sam abruptly stuck her hands down and held the skirt in place, her rosy cheeks blushing further pink as some shifting could be heard below the skirt.
The frilly garment began to bulge outwards at the rear, a growth that spread towards the front where Sam's hands tried in vain to press it flat. The whole thing shuddered, then her hands were pushed away as a bright white petticoat materialized underneath them and lifted her skirt back to the height it had been had before, but now much wider and poofier.
The changes seemed content to stop there, and Samantha let out a breath of relief. "Whew," she said, "wasn't expecting that. Probably gave you two a nice show when it puffed out though," she said, pouting her lips cutely. "What did you think Amy?" she said, turning toward the horse girl.
The horse girl didn't answer however. In fact, she didn't appear to have been paying attention to the changes Sam had at all. Amy was still a few paces behind them, clutching her arms tightly around her stomach, her snout twisted in discomfort.
"Amy!" said Lina, throwing a worried look at Sam before rushing over to her friend. Samantha followed close behind.
As they got close, the could hear a tremendous rumbling and groaning coming from Amy's body, as though her guts were writhing like snakes.
The rumbling and groaning increased in intensity, and Amy's form began to shudder and diminish. Her frame shrank and height inward, and her thick equine musculature began to deflate. Inches of height and pounds of muscle schlorped off her figure.
Soon enough, the slimmer form of her original body began to reappear under the fur. Her clothes, fitted for a much more filled out mare, began to hang loosely on her.
Her broad torso crunched back into its normal shape, returning her slim waist. Her muscly ass gurgled, shrinking slightly but remaining round as some of the depleting mass shifted to fat.
After a minute or two, the deflation of the horse girl stopped. She looked much thinner than before, back to her normal shape not counting the hooves, tail, fur, and head. Taking deep breaths through her pseudo-snout, Amy opened her eyes and examined her form.
"Are you all right?" asked Lina.
"What happened?" said Samantha curiously, "did yoo--oou take something in the store?"
"I'm fine," said Amy, though the flicking of her ears and tail betrayed her tension, "and no, I didn't try anything new in the store today. Today was just for you two."
"Then why did you just get small?" said Samantha.
"The shake must have worn off," said Amy, more to herself than the other two girls. She turned, noticing Sam's confused look and explained, "I drank a protein shake from a vending machine back when I was find ways to be horsier. It gave me a mare's physique."
"Geeighhuess it wasn't meant to last that long." she said, somewhat ruefully, plucking at her loose shirt with one hand while holding up her shorts with the other. "I wonder how long the other changes I have will last? I didn't check at each stop I made."
"Well," said Lina, lightly punching the slender mare's arm, "eee-ee-eeven if a bunch of it fades, it's not like we can't go back and redo it!"
"Plus we've still got a bunch of new stuff to play around with," said Samantha pointedly, "might be best to be a bit more human when trying some of it."
"True enough," said Amy, looking a bit better as she adapted to her new frame, "let's hurry to your place though, Sam, it's gonna beeighh hard to walk while holding my pants up."
Samantha snickered, then picked up the shopping back that Amy had dropped. "Let's move it then, mini-mare" she said, sticking her tongue out.
Lina laughed while Amy snorted and rolled her eyes. The girls resumed their walk, and very quickly found their way to Samantha's apartment. Samantha unlocked the door and entered, depositing the bag she was carrying on her couch. Lina put the others next to it.
"Make yourselves at home," the girly girl said, popping a small bubble and causing a white Peter Pan collar to slide out from her sweater's neck. She sucked the gum back into her mouth, "let me grab you some clothes too Amy, you look kinda close to my normal size.
With that, she padded off to her room while Amy and Lina sat down on the couch.