Grace awoke with a moan, thrown to the floor by the explosion her body ached. Judging from the fading light coming through the window of her lab she had been out for several hours. As her eyes drifted down to her body she jolted in shock and gasped, she was covered in sweat and bloated, her stomach distended like she had eaten enough food for a family of four. Despite this she was starving, but first she needed to make an antidote, clearly her experimental pig growth serum was having some effect on her.
Stumbling to her feet, Grace made her way to her work bench to begin setting up equipment to make an antidote, she needed to be quick before the serum did something more than just make her bloated. Before she could begin work though the plate of sandwiches Holly had made for her earlier caught her eye, absolutely ravenous Grace couldn't help herself, a quick sandwich or two before she got to work couldn't hurt right? Unbeknownst to her as she began to wolf down the sandwiches Grace had sealed her fate, with an empty stomach the serum's effects had been drastically slowed, but now with a source of energy her changes were about to explode into action.
As she greedily finished a third sandwich Grace felt a strange sensation in her rear, she twisted to look what was happening just in time to see her ass begin to rapidly swell in size, moaning she fell forward onto the workbench as her ass ballooned out, her pants stretching as it did. "No, no, no! Not now!" screamed Grace, as her pants gave way, falling to the ground to make way for her growing behind. Her panties were also getting increasingly tight, and they too gave way as a curly tail erupted from her tailbone. Grace squealed as she felt her vagina begin to shift and move it's way up her rear, settling beneath her asshole, as it did it morphed into what was unmistakably a sow's orifice.
"This isn't what I had in mind when I wanted our pigs to grow faster!" Said Grace in a panic, "I need to...unehhhh reeeee!" Grace's words were cut off by a pleasured squeal as more changes began, her ears enlarging and flattening out and her torso growing and fattening with each passing second. Grace stumbled out of her lab, and began to make her way down the short dirt path to their pig pen. She was overcome with hunger, and the smell of the food scraps and slop in the pig's feeding trough were suddenly quite appealing to her. She barely managed to climb over the wooden fence and fall into the mud on the other side. "Fuck! I'm so hungry... I know I shouldn't but I have too.." moaned Grace, she began to crawl towards the feeding trough, as she did her legs and arms twisted and morphed, reshaping into four legs more suited to a quadruped, her hands and feet soon followed suit and turned into trotters, her shoes discarded as they did.
Finally reaching the trough Grace began to devour everything she could get her teeth into, she no longer had hands to help her, but she managed none the less. Fueled by the influx of food her changes accelerated once more, Grace's torso had now fattened to the point her clothes could no longer contain it, and her shirt ripped along her back and fell into the mud beneath her. Now her bra was her sole remaining clothing, it dug painfully into her flesh, however as her breasts began to bulge along with the rest of her body she was finally given sweet relief as it too gave way and fell to the ground. Her breasts, now enormous, pulsated and shifted into teats, soon they were joined by more as she rapidly grew additional pairs along her stomach.
Had anyone passed by the pen they would have been shocked to see what appeared to be a huge sow with abnormally large teats and the head of a young woman, slop matted into her dark tresses. But the sight did not last long, Grace's time as a human was about to come to an end, but she no longer cared and continued to munch on the slop. Her body buzzed with pleasure, in between mouthfuls she moaned in ecstasy, as her face began to pull forwards into a snout she gasped "ooooohhh, I don't care anymore... I want to be a fat pig... ugnh ahhhh reeaaree!" her words cut off into a squeal as her transformation ended. Now only a fat sow remained in the pen, the only clues to its former identity being the scraps of clothing and the dark hair still growing from it's head.
The new sow, its hunger satisfied for the time being, found it replaced by a different type of hunger, as lust overcame her she knew it was time to breed, as fluids gushed from her genitals she made her way towards the pig shed on the other side of the pen, it was about to be a boar's lucky day.