Jess sat on Mary's bed eying the vial of colorless potion in Mary's hand. She began to think that a pig wasn't the best idea for her first try. "I dunno, Mary," she said timidly. "Maybe you should try a vial instead."
"I've already tried two of them," Mary said encouragingly. She held the vial closer to Jess. "C'mon. It'll be fun! We can always change you back."
Jess gulped hard. "No. This is silly, I can't be a p--mmmmpphh!"
Mary had uncorked the vial and forced it between Jess' lips. Jess scuttled back on the bed, trying to get out of her reach, but it was too late. Mary withdrew, noticing that almost half the liquid was gone from the vial. She glanced over at Jess, who was now at the head of Mary's bed leering at her.
"What did you do that for?" she shouted as potion dribbled down her chin. "I said I didn't want it!"
Mary replied coyly, "You will. Trust me."
Jess was already beginning to feel something was happening. Her entire body felt funny, like her insides were stretching out. She could feel herself slowly sinking farther into the mattress. Her pants and bra tightened uncomfortably.
"Wh...what's happening?" she stuttered. She was afraid, but mostly because the waist of her pants was beginning to hurt. She pulled up her pants and saw that her stomach was widening. A small ring of fat was pinching out of her waistline. She fumbled to undo her pant button. It took a minute because, for some reason, her fingers weren't behaving right. Once it was out her zipper burst open. Jess let out a shriek, but it sounded uncannily like the squeal of a pig. Her waist felt all right now, but her bra was still very tight, and the insides of her pants were very constricting.
She didn't have time to concern herself with any of that, however, because she had discovered why her fingers felt so weird. They were blending together in a grotesque, skin-melting fashion. As her pinky fingers merged with her rings, and her middles with her indexes, the individual nails on each grew, widened, and joined together. They darkened to a solid black and encircled each new, thick finger almost 180 degrees. They looked distinctly like parts of a hoof. Her thumbs grew short, pointed hoof-like tips as well.
Mary was watching her friend intently. The changes Jess was undergoing were incredible. It was one thing to grow a cow's udder in one's sleep, but to watch another person start to fatten up and grow pig features was eliciting very exciting emotions in Mary.
"It hurts!" Jess squealed. "Ow ow ow ow!" A pain had sprung up in her bottom, and as she rolled her larger body around on the bed to do something about it, she heard a tear in the seat of her pants. The pain stopped immediately. She turned her head on her widening neck and saw a short, curled pig tail sticking out of her pants. "I don't believe it... I just don't believe it!" She turned to Mary, hoping she could confirm that she wasn't going insane. Mary gave her a smile and a nod.
"Nice ears," Mary said.
Jess used her new hands to feel her ears. They had gotten a lot bigger. She let them go and they flopped in two triangles on either side of her head. She could also feel her nose curling up a bit.
"Let me help you with those shoes," Mary said, expecting there to be a significant change down there as well. She already knew what it was like to have cloven hooves instead of feet. She undid Jess' shoes as Jess testily poked at her own tail. Mary gasped in surprise.
Jess hadn't grown hooves, but her feet certainly had changed somewhat. Now she only had two thick toes on each foot, with long nails much like those on her fingers. She must not have taken enough of the vial to warrant as major a change as Mary had. Then again, Mary had only changed from the waist down. Jess was changing all over, so the degree of the changes may have been spread out.
Now another strange weighty feeling arose in Jess' chest. She lifted her shirt up and saw some dark spots on her skin. As flesh began to rise around each spot, Jess realized what was happening, and she pulled her shirt down again quickly. She shot a surprised look at Mary.
Mary had seen them, too. She was looking back at Jess with wide eyes. "I guess...well, pigs do have extra nipples...I grew an udder, so I guess you're growing..."
"Yeah...," Jess mused. She may have been prepared for the tail and the ears, but growing six more breasts was completely unanticipated. She could feel their warm weight growing on her chest, and soon they were big enough to be seen underneath her shirt.
The changes subsided after that. Among her piggish attributes, Jess had gained a visible amount of weight. Her hips widened so much they were threatening to burst the seams of her pants. Her shirt was very tight on her thanks to the wider arms and the eight hefty breasts. Her face had even rounded out a bit.
Mary helped Jess to her feet. She had to think carefully about balancing now. She guessed she had put on at least thirty pounds. "Oh, you are so cute, Jess!" Mary threw her arms around her porcine friend, pressing her arms into her soft new layer of fat. "Now tell the truth, how does it feel?"
"Well, actually..." Jess glanced over her body one more time. She even ran a hand around her four rows of breasts. "It's weird, but...exciting! I don't think I'd want to go outside looking like this though!" She snorted puffs of air out her nose as she giggled.
"Great!" Mary smiled. "I knew you'd come around! So what's next?"