Doubling the Male Vial had enhanced its effects on Mark. He wondered whether the same would apply to the other vials. Obviously the Female Vial would act much like its spear counterpart, but in reverse. What about the animal vials? Once someone had turned into a bear, what effect would another dose of the Bear Vial have on them?
Then again, Mark hardly wanted to turn someone into an angry, rampaging bear to satisfy his curiosity.
He hummed as he scanned the labels for something a bit more benign. He let in a sharp intake of breath as he found the Pig Vial. He plucked it from its slot and emptied it into Greg's beer bottle. When Greg had turned into a pig, he'd give him another vial--
Mark halted in place. There was no way Greg would cooperate once he knew what Mark was doing. He hesitated and then replaced the Pig vial to refill it. He emptied a few more doses into his beer bottle until the spiked beer reached the lip of the bottle. Hopefully he'd drink it all before he noticed any changes.
Mark picked up the two beer bottles and returned to the living room. Greg accepted the beer with a silent nod of thanks and drank a full half of it in one go. Mark looked nervously at the unfinished bottle, worried that he would begin to change without all of the doses of the vial. However, as he watched, Greg didn't seem to be changing. Mark tore his eyes from Greg's body and forced himself to watch the TV. Greg still hadn't decided on a channel, and nothing stayed on for long. He paused from his channel surfing to take another long draw from the bottle.
Mark nervously looked at him from the corner of his eye. There still weren't any obvious changes-- wait! There, Greg's flat stomach pushed out. It was subtle, but his skin was shifting under the cloth. Greg didn't seem to notice. He was still taking slow swallows. Mark noticed a hint of a drooping jaw. Greg's small pouch of belly inflated like a balloon. It looked cartoonishly like the beer was going directly to his stomach, but Mark bit the smirk off his lips; he knew that this technically was no laughing matter.
As Greg pulled the bottle straight upward and finished it off, his belly was beginning to poke out of the bottom of his shirt. He still hadn't seemed to have noticed the changes, but as he leaned over to place the bottle on the coffee table, he did. His new, still-expanding belly got in the way of leaning forward. He froze in place, shocked into inaction. Mark innocently grabbed the beer bottle from his hand and placed it on the table for him.
The contact jarred Greg from his reverie, and he slowly and uncertainly reached towards his belly which was still expanding and pushing his shirt further and further up. He made some kind of detached murmur, and that broke the dam.
"Wh-what's going on?" he finally said, his hands shaking as they rubbed the soft fat. The question caused Mark to look up to meet Greg's gaze, and he noticed that his head and neck had similarly fattened up as well. Now that Mark looked, he noticed that Greg's butt was growing fast as well. His jeans were strained by the mass. Greg scrambled in his seat to get a good foothold on the floor, but his balance was thrown off by the unfamiliar weight. As he flailed, the unmistakeable sound of ripping fabric tore through the air. Greg froze, but only for a moment. He quickly lost balance and fell back onto the couch. Greg's jeans had torn across the bottom, revealing similarly strained boxers. Another tear rang through the air and, and Greg finally found purchase on the floor to stand upright. He pulled wildly at his clothes like they were on fire and managed to pull his torn jeans and boxers off of his butt, which bulged out towards Mark's face as they were freed from the too-tight clothing. Greg pulled his strained shirt off over his head and stood naked in front of Mark.
"What did you do to me?!" he gasped at Mark. He hyperventilated as he ran his hands over his misshapen, swollen body. Then... the changes began to get grotesque.
Greg's arms, which had so far been spared the changes, were getting thinner straighter. They twisted around into an uncomfortable-looking position, and Greg's hands got slower and more sluggish as he yet rubbed his belly. As his manual dexterity plunged, he finally pilled them from his swollen body and looked closely. His fingers changed shape, getting shorter and stubbier. He let out a shriek of terror and shook his hands as if something were stuck to them. The blur of movement was too indistinct to make out, and when Greg held them still to look at them again, a thick hard material had replaced the tips of his fingers, which were grossly out of shape.
"What-" he began again. "-What is this?!" He turned to Mark, who had watched silently the whole time. Mark opened his mouth to say something, but Greg cut him off with more hysterics.
"What is happening to me!" he shrieked, his voice jumping up an octave in terror. "What's wrong with my haa--!" his panicked voice cracked into an undignified squeal.
"This isn'th whah..." he began, but he struggled to spit out the words. His legs were following suit of his arms. As they thinned, they began to shake as they strained to hold his weight. Suddenly, they snapped into different orientation, and Greg fell to the floor in a magnificent tumble. He squealed in pain.
"Ah cah--" he tried, but his mouth jutted forward, cutting him off. Greg tried again to speak, but his elongated, unfamiliar mouth prohibited it. All he managed were incoherent vocalizations interspersed with porcine squeals.
His face deformed. It was no longer recognizeable as Greg. His jaw had extended out of shape, and his ears had fanned out and slid up his skull. His dark blonde hair thinned and receded into his head. Greg tried to stand up, but his new skeleton forced him to remain on all fours. He tried to cry out, but his new voice only produced squeals and oinks. As his snout pushed out and his eyes slid further apart, the last of his human hair had vanished. The transformation skidded to a halt, leaving Greg, a pig, standing shocked on the living room floor. He looked up at Mark, trembling.
Mark stared in astonishment. He knew what was going to happen, but his imagination hadn't compared to the real thing happening before his eyes. He guessed he imagined a smoother, less terrifying transformation. But then, his own changes hadn't exactly been a cup of tea, either, and he was still human before and after.
Greg let out another oink of surprise, and Mark looked back as the transformation kicked back into gear. The pig swelled with fat. His face widened, and his belly inflated in one big piece. His skeleton seemed to be getting bigger, too. The vaguely cute piggy parts of him melted away as he grew into a much larger hog. Mark dimly remembered the extra doses of the Pig Vial he had poured into Greg's bottle. Apparently its idea of enhanced pig-ness was a larger, fatter pig. He supposed it made sense.
Greg just stood there on all fours, trembling and holding onto the floor for dear life. He grew bigger and bigger, until he suddenly hit some sort of limit. His skeleton stopped getting bigger, but the fat wasn't quite done. The fat packed onto the massive pouch of his belly. His head, back, and butt all fattened up as well, but it didn't look like Greg could take much more. Mark felt a pang of guilt. He probably should have done this more carefully instead of just sneaking several doses onto him all at once. He had forgotten exactly how many doses of the Pig Vial he had poured in.
The fattening slowed just as Greg's belly brushed against the floor. When it finally stopped, a decent amount of it was now fully resting on the floor. Greg took a shaky, tentative step forward. With his weight and unfamiliar body, he was barely able to move at all. He looked up to Mark, scared and shaking.