The cake is a truth?

“Good morning, subject Haley.”
Haley blinked slowly twice, as her eyes slowly slid into focus. From what she could tell, she was lying on her back, staring up at the tiled ceiling. Without warning there was a slight whoosh, and what appeared to be a glass cover over her appeared to open. Haley slowly exited what looked like a futuristic cocoon, and came to her feet. She appeared to be in a 15”x15” see through cell, complete with toilet, and radio.
“Hello and again welcome to the Aperture Science Computer-Aided Enrichment Center. We hope your brief detention in the relaxation vault has been a pleasant one. Your specimen has been processed and we are now ready to begin the test proper. Before we start, however, keep in mind that although fun and learning are the primary goals of the enrichment center activities, serious injuries may occur. For your own safety, and the safety of others, please refrain from-”
“Aperture science, hunh? How did I end up here?”
“You were chosen from a pool of willing volunteers, ones who are ready and willing to do whatever is necessary to improve Aperture Scientific studies. You are the lucky subject chosen to show effects of cake on the human body. Please enter the portal so we can begin studies with ease.”
“What portal? And who are you?” There was a slight “pwap” noise, and on the wall in front of her, a large blue oval appeared.  Inside the oval, Hailey could see a dimly lit room, with a table in the dead center, on which stood the most scrumptious cake Haley had ever seen.
“My name is glados, and I will guide you through the testing procedures. Now step into the portal to begin the testing procedure, or there will be no cake.”
Haley glanced around the cube once more, and having found no other viable exit, stepped through the portal. Haley felt a slight shocking sensation throughout her entire body.  Once she felt the peculiar leave her person, she opened her eyes. She quickly deduced that she was in the room she had seen through the portal.
“How…!?”
“Now you have experienced the wonder of the Aperture science portal device. Please be advised that a noticeable taste of blood is not part of any test protocol, but is an unintended side effect of the Aperture Science portal technology, which may, in semi-rare cases, emancipate dental fillings, crowns, tooth enamel, and teeth."
Haley landed with a soft thud. She gently got to her feet, and took a look around. She was in a rather bland, almost medicinal looking room, with alternating gray and red tiling throughout. In the middle of the room lied a wooden table, of about waist height.
“Well, that’s great” Haley, said, rolling her eyes. It was about that time that most delectable smell imaginable hit her nostrils. She sniffed the air eagerly. “What is that delicious smell?”
“Cake trial number 1 will commence in 3…2…”
There was another pwap noise, and another oval appeared on the ceiling above the table, only this one was orange. With a clang, a small plate landed on the wooded table. On top of it was a slice of what appeared to be the most decadent chocolate cake on the face of the planet, accented with a lone birthday candle at the top. The smell alone was intoxicating, but upon seeing just how delicious the cake looked, there was no holding back. She somehow dashed to the table, threw the candle to the corner of a room, and devoured the slice, all in about 4 seconds.
Haley was covered in chocolate in fudge. In fact, her orange jumpsuit had a large smear down it, and there were speckles of chocolate strewn about her medium length blonde hair. However, none of this seemed to faze Haley in the least. Nothing, it seemed, would seem to faze her, for Hailey was in ecstasy. The pleasure sensors in her brain were all going off on full throttle. Mind on nothing but the immense pleasure searing through every synapse, she failed to notice four portals appearing on the ceiling, nor the four turrets that dropped from them. She completely missed their cries of “Target Acquired”. She failed to notice a small golden bubble envelope her person, and the turret bullets all bounce off.
Haley did notice the turrets all disappear in unison.  Having missed their synchronous entrance, she wanted to question what she had just missed, but she couldn’t. Her pleasure rush had just subsided, but her mind was in a terrible fog.
“Subject, what is your mother’s Maiden name?” “Andrews” she responded dreamily.  After a moment, Glados responded: “Subject, please perform the chicken dance for me.” Haley, now completely aware of her actions, but void of the will to stop them, proceeded to perform a spot on rendition of the chicken dance. “Part one of the experiment is complete, and is marked by a success. Part two of the experiment will begin in three… two… *click*”  
Right on the click, another blue portal appeared on the ceiling, through which fell another slice of cake. This slice, however, was white in color and frosting.  Haley watched the cake fall to the table, with an almost dopey look on her face. “As part of a required test protocol, we can no longer lie to you. Therefore, once the test is complete, you will be… missed.”
Haley tried to contemplate on what Glados’ words could possibly mean, but nothing could penetrate the thick fog that was her mind. “Subject, please proceed with the devouring of the test sample.” This time, Glados’ words managed to pierce the fog.  Haley grabbed the plate, and crammed the whole mound of vanilla goodness into her mouth. This cake was pretty great, but not as good as the first one.
“Fantastic job subject. Now we proceed to the final test”
Meanwhile, Haley didn’t look so good. Her belly slightly dissented, and her face portrayed a look of pain. “Uggh, no more cake. My belly can’t hold another bite.” She declared, her head suddenly clearing. The pain was immense. In a futile attempt to alleviate the searing pain, she undid the zipper on her orange jumpsuit. Her belly bobbed slightly having gotten free of its restraints, before coming to rest. There Haley stood, in her unflattering matching grey bra and panties.
After a moment of science between the two, a small blue portal appeared over the table. From it dropped a small pink bottle. “Pepto? Seriously? That’s all you have for this?” she asked grudgingly.
“While some physical discomfort is expected in most testing situations, it is not part of this test protocol. Therefore, I must that you partake of this Aperture Science approved indigestion cure.”
Desperate for relief from her discomfort, she quickly opened the small bottle, and chugged it down. Within moments, her pain had subsided. “Well, at least Aperture Science can do something right” she chuckled. As she reached for her discarded jumpsuit, she quickly realized something was amiss. While it wasn’t causing any physical discomfort, her midsection was slowly bloating outwards. “What the hell Glados?!”
“Side effects of Aperture Science indigestion medication may include a mild feeling of bloatedness”
“And you couldn’t have told me this sooner?”
“According to test protocol, any information related to this test will be given on a need to know basis”
Haley quickly realized that arguing was useless. “Damn I look like I’m ready to give birth. I guess it’s par the course here at Aperture Science.”
“We have made it to the final stage in this experiment. We must finish the test, or you will be terminated according to test protocol..”
“WHAT?”
“As was made clear in the contract you signed when you became an employee of Aperture Science, refusal to complete a required test will result in an unsatisfactory mark on your record, as well as forced termination.”
Haley fell silent. Not only did she not remember ever signing such a contract, she never remembered joining Aperture Science. In act, she was slowly starting to recollect how she got here. She had been walking along the sidewalk at the local strip mall with some of her friends, when a black van started following them. She had passed it off as paranoia, until she and her friends had walked the entire length of the mall with the van still in pursuit. She had broken out into a run, but didn’t make it far on the heels she was wearing. She fell, twisting her ankle in the process. It was then that two figures rushed from the van over to where she had fell. While she tried to fight back, she was no match for the two figures. They quickly grabbed her, and stuffed her in the van, all the while her friends were in shock. It must’ve been sometime during the van ride that she blacked out.
“ GLAODS! LET ME OUT OF HERE!”
“Hahaha, I’m afraid you won’t be going anywhere subject 32698.”
“LET ME OUT! I WANT OUT”
“Not until you finish the final part of this test.”
Haley took a deep breath, in an attempt to stifle her oncoming tears. She wasn’t going to let Glados see her cry. “Fine then, hit me with the final part of this experiment.”
“I thought you might come around.” And with those words, a final portal poomphed into existence overtop the table. After what seemed like an hour to Haley, she was dismayed when a small slice of cake atop a small plate landed on the table with a clunk.
“Subject, once you eat that final slice of cake, the experiment will be over, and you will be free to go.”
Haley’s spirits lifted upon hearing these words. On her own free will this time, she quickly made her way over to the table. “For science” she said, toasting Glados, before taking a massive bite from the slice of cake. She quickly downed the remaining cake, and took a bow.
“Not to bad. A little to much sugar in the frosting, but I did enjoy the strawberry. A Nice touch. Now may I go?”
“Not until it all digests”
“Not until it digests?!? What do you mean…” but Haley was cut short. Her stomach had given out a creaking noise, like it was under immense pressure. Suddenly, a warm sensation engulfed her whole body.
“Glados! What’s going on?”
“You’ll see, subject”
And then Haley noticed it. She looked down, and noticed that she could no longer see her feet. The bloatedness from the medication had dissented her belly far beyond its normal state, but she had then been able to see her feet., but no longer. Her belly had now taken on a softer look. She reached out to give it a poke, and noticed something else was amiss; her arms had taken on some mass as well. She pinched her side, and finally realized the horrifying truth.
“Glados! Is this cake making me fat?”
“See for yourself” A blue portal suddenly opened in front of her, and an orange one to her left. She could see it all. Her legs had plumped as well. Her thighs, which she had done so many workouts to tone and trim throughout her life, now resembled hams. Her stomach had begun to apron, and her breasts had already outgrown their casings, sending Haley’s bra flinging across the room.
“I’m turning into a blob!” Haley screamed.
“Finally, after months of research and testing, we have come upon the perfect mixture”
“Mixture, what…?”
“Well, seeing as you won’t be going anywhere for some time in your state, I suppose you can know. Aperture science was handed down a contract from the government for a new police tool for immobilizing fleeing suspects.”
Haley’s fat faced dropped, not only at the sheer oddness of what Glados had said, but also having just witnessed her panties rip and fal to the ground in shreds.
“Make it stop! MAKE IT STOP!” she cried, as if that would do anything. Unfortunately, she was approaching the point of immobility. Her neck had totally disappeared, leaving a second, third, and forth chin in its wake. Her breasts, which were still surprisingly perky, resembled peach colored watermelons.  Her stomach apron alone was large enough to store her old self in, and her ass and legs rounded out the massive package.  She tried desperately to cover her female naughty parts from the cameras, but her arms were just too weighed down with fat. Her legs, unable to stand the pressure any longer, buckled underneath the massive weight.
“I’m a WHALE!” she wailed, gazing upon her silhouette through the portals.
"Another Aperture science success.”
“BUT WHAT ABOUT ME?”
“Do not worry subject, the growth should wear off eventually.”
Eventually was right. Far after the lights in the room had been turned off. Far after her arms and legs were lost in a sea of fatness. Far after her sixth chin. Far after Haley had given up all hope of resembling a human again. It wasn’t until 3 days later that the growth finally came to an end.
Haley had been awake for hours, staring at the ceiling through what little she could see through her numerous rolls of fat. She finally felt the last flicker of that peculiar warmth from before leave her body.
“Oh god, why me? WHY ME?” she yelled through her fat rolls, her massive blobish form quivering with each  word. And thus Haley wept, and wept, and wept for hours upon end.  What Haley didn’t know about was the location of the room she was in. Fortunately (or unfortunately, depending on how you look at it) for her, the room she had been housed in stood a floor above the main atrium of Aperture Science HQ. After the initial strain of the massive form they supported, and the continued shock of Haley’s crying session, the beautiful roman style pillars holding the atrium (and her room) up just couldn’t stand the pressure any longer.
With a thunderous crash, Haley’s massive form fell through the floor, and coming to the floor with a might boom. Luck was smiling on Haley that day, as government inspectors has just arrived that day for inspections. Two of them were sitting at the small bar set up in the corner of the atrium when this whole scene unfolded. They were able to arrange for an 18 wheeler to come carry her off for medical attention.
They managed to surgically remove most of the fat from her frame. The rest, however, couldn’t be removed at all. Thusly, Haley took the plus sized modeling world by storm, and also became a well known advocate against human testing.

Fin.