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“Oh, well I’m sorry to hear that,” Dr. Harris said, glancing sympathetically at Evan. “You know, I’m still looking for a summer lab subject, if you’re interested in that.”

Evan’s ears perked at that. More time with his hot professor? Say less. “Really? You’d really take me on?” he said, excitement creeping into his voice.

“Oh yeah! I’d love to take you onto the project if that’s something you’d be interested in, Evan.” Dr. Harris said, sitting up straight in his chair and smiling. “All you’d be doing is helping me gather some data for an experimental trial I’m doing. Plus,” he continued, “it’d be a decent source of income while you find a new job,” he chuckled.

“That sounds great! When can I start?” Evan asked excitedly, heart practically jumping out of his chest.

“Wonderful!” Dr. Harris smiled as he passed a few papers to Evan across his desk. “If you’d like, I’m free Monday.”

-

And so that following Monday, Evan found himself at Dr. Harris’ laboratory much earlier than he’d normally ever dreamed of. He meandered through the maze of hallways before finally finding the right door. Opening the door, he saw his professor sitting at a lab chair, dressed in much more casual attire. The tank top he was wearing was just the right size, his arms immediately catching Evan’s attention. Evan’s heart beat a little faster at the sight of him.

“So Evan! Welcome to the new office!” Dr. Harris chuckled, extending a hand to shake with Evan. “I know you’re probably used to the labs by now, but let me show you some of the new machines I’ve been using.” he said, grabbing the lab coat hanging from the wall.

“So what exactly am I going to be doing here, sir?” Evan asked after Dr. Harris gave him a tour of his specialized lab.

“Well essentially, I believe that I’ve isolated a new man-made enzyme that creates a reverse reaction mechanism in the stomach,” he said, pointing to the whiteboard with many complex formulas and chemical equations scribbled across it, “which, in turn, allows the stomach to absorb more nutrients from food!” he said. He started to excitedly ramble on about his new discovery, and Evan’s head started to spin.

“Can you break that down into normal words for me,” Evan asked, barely able to catch the waterfall of words that excitedly left Dr. Harris’ mouth.

“Oh, right, of course.” Dr. Harris said, slightly embarrassed. “So pretty much, I’ve created a man-made enzyme in this vial that reacts in the stomach to multiply the nutritional value of everything you eat,” he explained. “All I need now is to inject a subject with this enzyme to test its effects. Which is where you come in.”

“I see,” Evan said, eyeing up the vial of clear liquid in Dr. Harris’ hand. “And are you sure this won’t accidentally kill me?”

“Of course not, Evan!” Dr. Harris laughed. “Believe me, with the amount of testing I had to do before I was allowed to test this on humans, I can essentially guarantee you’ll be fine. The worst that could happen to you is a bit of weight gain. But I guess at your age that’s not much to worry about,” he continued, scratching his greying beard.

“Well then, sounds good to me,” Evan said, and in no time at all Dr. Harris had already injected him with the vial of his enzyme.

“Alrighty then, Evan.” Dr. Harris said, standing Evan up. “If you wouldn’t mind, I’d like to get a starting weight measurement of you before you leave.” he said, bringing the industrial scale over to where Evan was standing.

Evan agreed and slid off his shoes and stepped onto the scale. The bright red lights spun around for a second before finally coming to a conclusion. “148 pounds…” Dr. Harris mumbled to himself as he scribbled down the number into his notepad. “Well Evan, thank you for advancing my research!” he said, and he pat Evan on the back, who’s heart immediately began to rush. After all the lights were turned off, the two men left, agreeing to meet back again for a check-in in a month.

Evan went about the next month the way any unemployed college graduate like him would: by staying at home all day and playing video games. Sure, he’d also been applying for jobs, but the generous paycheck Evan received from Dr. Harris in the mail a few days later meant that he wasn’t in too big of a rush to start working. As a result, he spent most of his day inside, ordering food and barely ever leaving the house in order to play video games. Usually, this wouldn’t do much to Evan, but the experimental enzymes in his stomach were already busy converting even the smallest snack into hundreds of calories. As a result, he noticed his shirts had begun to fit him a little differently after a few days. He’d also started to get hungry more often, finding himself constantly snacking on whatever he could find. After only three weeks with Dr. Harris’ experimental enzyme in his system, his body had already grown considerably softer. His belly was nearly perfectly spherical, sticking out from his growing frame. His ass was getting bigger too, pushing against the back of all of his pants. He was even beginning to have a hard time buttoning them, having to take multiple tries to get the button over his soft middle. His whole body started growing softer without him even trying, his twink body growing softer every day. Evan didn’t know why, but a sense of denial coupled with Dr. Harris’ assurance that nothing would go wrong meant that he never made an attempt to slow down the weight gain. He just kept eating, and his body kept growing softer.

“Welcome back, Evan!” Dr. Harris greeted Evan as he walked in, dressed in a short sleeve shirt and shorts in a desperate attempt to beat the summer heat.

“Hi, Dr. Harris,” Evan said, walking in and grabbing the seat by him. Fuck, he looks so hot, Evan thought to himself.

“You don’t have to keep calling me that, Evan. I’m your coworker, not your professor anymore. You can call me Brian now,” he said, dropping his professional tone and smiling at Evan.

“Oh! Well thanks… Brian,” Evan said. It felt weird to call him by his first name. “And everything was great! I didn’t die!” he said, laughing at his unfounded fear from last time.

“Well that’s always good to hear,” Brian said, grabbing his clipboard from the table. “If you don’t mind, I have a few follow up questions for you. Have you noticed a change in your eating habits? And are you eating more or less than you were before?”

“I guess everything has been more or less the same…” Evan said, still in denial at how much his habits had changed. “Maybe an extra snack or two but that’s about it, Brian.”

“I see!” Dr. Harris said, writing on his clipboard. He shot a quick glance at Evan’s body. “And have you gained any weight? Or anything else?”

“Maybe a little…” Evan said as he lifted his shirt up a bit to show Dr. Harris. Dr. Harris immediately made a face of surprise as he looked at Evan.

“Oh wow, you were such skin and bones when you were here last time,” Brian said, face turning slightly red as he looked at Evan’s midsection. “Um, would you mind if I got another weight measurement from you?” Brian said, a slight waver in his professional tone.

And once again, Evan stood onto the scale and waited for the spinning red lights to finish calculating his weight. After a few seconds, the scale finally stopped, reading 229 pounds.

“Woah, 229 pounds!” Dr. Harris said, eyes still fixated onto Evan’s belly as he recorded his new weight. “Guess you weren’t joking about those meals, huh big guy?”

Evan could barely believe what he just heard. 229 pounds? I’ve really gained 80 pounds? He looked down at his new belly and was surprised at just how much space he took. The shirt he was wearing today was even stretched out a little trying to accommodate for his new weight. Fuck, I’m fat! he thought to himself as he thought of just how blind he was to miss his growth.

“Oh, wipe that look off your face, champ!” Dr. Harris said cheerfully, poking his pen into the side of his new belly. “Don’t worry, it doesn’t appear to be affecting your health, and many people like bigger men! I know I do,” he said, before realizing what he said, his face getting a bit pale.

“What, Brian?” Evan said, almost convinced he didn’t hear what he just said.

“Oh, nothing. Just thinking to myself.” Dr. Harris said, feigning ignorance while messing with his clipboard and lab coat. “Alright Evan, time to close this lab down.”

And as the two men finished cleaning up the laboratory and turned off all the lights, a plan began to brew inside Evan’s brain. If he was going to get closer to Dr. Harris, he was going to have to appeal to his taste. And if that meant gaining some more weight, then he was going to gain as much weight as possible before their next check-in next month.

-

And so Evan got to work. If he was going to win over Dr. Harris, he’d have to make massive changes. He began eating more than he’d ever eaten before in his life. He began doubling the sizes of his meals, with enough food to feed multiple people making its way inside his greedy gut. He was ordering fast food multiple times a day, gorging himself on fried, greasy food pretty much every meal. He was also spending his entire day lazing around his apartment, barely ever getting up from his video games in an attempt to conserve calories. He’d even began to make his own gainer shakes, drinking one every night before he went to bed. It was like everything he did was a carefully calculated move to purposefully make him fatter.

Evan’s gains were also considerably helped by the enzyme Dr. Harris created that was flowing through his growing body. As if the sheer amount of food he was eating already wasn’t enough, his stomach was also busy multiplying all of calories Evan was eating. All those extra calories that was being produced by his body only had one place to go: his expanding waistline. After a particularly big meal, Evan could swear he could feel himself growing fatter as he sat on the couch, his body working overtime converting his meal entirely into fat.

The results of his new lifestyle were completely inevitable. Evan had grown into an absolute fatass in the month since his last visit with Dr. Harris. The seemingly modest pot belly that he’d had only a month ago had now blown up into a massive ball belly, by far the biggest and widest part of his body. Not far behind was his ass and his thighs, which rubbed together with every step he took and could only be contained by Evan’s stretchiest sweatpants. His moobs were two mounds of pure fat on his chest that perched gently on his swollen gut. His entire body had blown up like a balloon, and he almost felt excited at what he was doing to himself. The fatter he got, the more he grew to enjoy rubbing his belly, jiggling his moobs, and stuffing himself silly. It was like every day was a competition to see how much weight he could gain. Evan looked at the massive version of himself in the mirror and smiled to himself as he jiggled his belly. He couldn’t wait to see what Dr. Harris’ reaction was going to be tomorrow.

-

“Good morning Ev-woah” Dr. Harris said, his voice quivering as he opened the door and laid eyes on the fattened version of Evan sitting right in front of him.

Evan made sure to put on as much of a show as possible for his former professor. He showed up in the smallest and tightest clothes he could find in his closet, meaning that he was squeezing himself into clothes that were practically bursting at the seams trying to contain him. The shirt he was wearing was covered in sauce stains, and couldn’t even reach his belly button as it dug into his soft sides. The sweatpants he was wearing stopped fitting him over 50 pounds ago, but by some miracle Evan managed to squeeze his fat thighs and hefty ass into them without ripping them. He looked like a prize fatass sitting there, legs spread apart and his belly surging into the empty space, and he knew Dr. Harris could see it.

“Hey Brian!” Evan said cheerfully, one hand lazily resting on the top of his gut. “Another month without me dying!”

“I can see!” Dr. Harris said, desperately trying to conceal how attracted he was to Evan’s new size. “How was the past month?”

“Okay, well… I’m going to repeat the questions I asked you last time, if you don’t mind.” Dr. Harris said, grabbing his clipboard. Evan was glad to see his plan working. Dr. Harris looked like he only had one thing on his mind.

“So… have you noticed a change in your eating habits? Are you eating more or less than you were before? And have you noticed any ”

“Oh man, I’ve just been so hungry this last month!” Evan said, making sure to exaggerate the key words. “It feels like no matter how much food I eat, I’m never full enough.”

“Mmhmm,” Dr. Harris nodded, face flushing bright red as he scribbled on his clipboard.

“I’m pretty much at the point where I’m eating the whole day. But I guess you could probably tell that.” Evan continued, feigning embarrassment as he pat his belly in front of Dr. Harris.

“It looks great,” Dr. Harris said, before suddenly catching himself. “I mean… let’s get you on the scale,” he said, failing to hide his growing obsession with Evan’s gut.

Evan heaved his body up from the chair to stand on the scale. Looking down, he could only see the top half of the screen, his belly obscuring the rest from view. “I… can’t read it,” Evan said, now his turn to blush. “What does it say, Brian?”

“The scale says you are 354 pounds, Evan.” Dr. Harris said, writing the number down. “Rather impressive, I must say!” he continued, poking a finger into Evan’s belly.

Evan smiled internally at the news. 354 pounds! His hard work had definitely paid off, and he was bigger than he had ever dreamed of. He’d just gained 125 pounds in the time since his last visit! He looked down at his belly in his tight clothes, a far cry from the skinny little college graduate he was only a few months ago. He took his seat again, adjusting his clothes so that a bit of belly hung out from the bottom.

“If… if you don’t mind, Evan” Dr Harris said shakily, “This much weight gain in such a short time is… quite interesting.” His face was growing redder by the second. “I’d like to examine your body to make sure everything is all good,” he said, his arousal growing almost overwhelming.

“Oh, sure Brian,” Evan said smugly as he struggled to get his tight shirt off. Yes! It’s working! Without a word, Dr. Harris gingerly placed a hand on the roundest part of Evan’s gut. He relaxed as he felt him make small gentle circles on his exposed belly. As Dr. Harris’ hands explored more of his belly, Evan grew more aroused by his former professor. Evan’s hardness began to press against the already tight fabric of his sweatpants. Evan closed his eyes and smiled as he felt the warm, calloused hands travel slowly across his soft belly.

It didn’t take long until Dr. Harris began to lean into Evan, his hands growing more curious as his entire body grew warm with anticipation. Evan, too was beginning to lean into his belly rub, leaning forward and feeling his fat body ripple. Evan’s face was only inches away from Dr. Harris’, until without saying a word, they both leaned in to make out.

Evan was almost surprised at how good of a kisser his nerdy professor was, his soft lips pressed against Evan’s. Dr. Harris’ hands got more rough as Evan used his own hands to fumble around with the buttons on Dr. Harris’ shirt, sliding it off his lithe body in no time. A sigh of pleasure escaped Evan’s lips as Dr. Harris hungrily began grabbing handfuls of his belly. Muscular torso exposed, Evan’s thumbs immediately rushed to Dr. Harris’ pecs, teasing his exposed nipples.

“You like this, Brian?” Evan growled as he pressed his face into his neck,

“Yes, Evan,” Dr. Harris whimpered into his ear as Evan grabbed him by the back and pulled him into his belly.

“Then get on the desk,” Evan demanded playfully, standing himself up and shimmying his tight sweatpants off. Dr. Harris quickly complied, quickly rushing to trade places with Evan.

“You want to feel all the weight you’ve put on me, Brian?” Evan asked devilishly as he bent Dr. Harris over the desk.

“Please,” he responded between moans, his back muscles now exposed as Evan approached him from behind.

Evan wasted no time mounting his professor’s firm ass, dramatically exhaling as he flopped his belly on top of his slender back. From somewhere underneath his belly, he could hear Dr. Harris moan softly. Grinning to himself, he began to grind his hard dick on Dr. Harris’ firm ass. This continued for a while, their breathing growing heavier as they began to sweat. From underneath his belly, Evan began to slide off Dr. Harris’ pants, leaving both of them in only their underwear, their bodies pressed against each other.

“Turn around, little guy,” Evan demanded suddenly as he heaved his big body off Dr. Harris. He obeyed silently, and Evan dropped his belly onto Dr. Harris’ abs.

“Keep rubbing my belly, Brian,” Evan said as he began to slowly stick his dick inside his ass. Dr. Harris relaxed and grinned as he felt Evan penetrate him, his hands glued to Evan’s jiggling belly. This only energized Evan, who’s thrusts began to grow more powerful as he stuck his cock deeper inside of his former professor. His thick hips slammed into Dr. Harris’ ass, sending small ripples across his belly that went up to his moobs. Dr. Harris’ moans grew louder, hands still squeezing Evan’s fat belly as he began to grind his dick into his soft underbelly. Pinned down by Evan’s belly, all Dr. Harris could do was lay there and take all of Evan’s hard cock as he ran his hands roughly across the massive man’s rolls.

In the back of Evan’s mind, he couldn’t believe how good it felt to finally be fucking his stud of a professor. What he wasn’t expecting, however, was how good it felt to have his belly caressed and rubbed the way it was now. His cock was screaming in arousal with every swoop of Dr. Harris’ hands across his gut.

Evan and Dr. Harris continued moaning, their thrusting suddenly speeding up when Dr. Harris came first, his face awash with pleasure as he shot his warm load across his chest and Evan’s belly. His eyes rolled back into his head as Evan kept thrusting his hard cock inside of him, faster than ever. It didn’t take much longer until Evan also came, his load shooting deep inside of Dr. Harris. He moaned in deep pleasure as pump after pump of cum left his sensitive dick. The two men just lay there on top of each other, sweaty and moaning as they gasped for air. Evan smiled to himself, hands still on Brian’s body. He never imagined it would be like this, but sex with Dr. Harris was even better than he ever imagined.

-

“Let me see what I have in the freezer…” Evan wondered aloud as he got up from the couch. He waddled around his apartment shirtless, in the loosest pair of sweatpants he owned. Even the new clothes he’d bought were beginning to feel tight on him, meaning that nowadays Evan was almost always shirtless around the house. Plus, it was more comfortable that way anyways.

A loud rumble from his belly punctuated the otherwise quiet apartment. Ever since his monumental 200 pound gain a few months ago, it felt like all Evan was these days was hungry. Bags upon bags of food were placed at his table, courtesy of the massive delivery order Evan made earlier. He went to go turn on his TV, but a knock at the door made him look up. Heaving himself up from his chair, he made his way to his door.

“Brian?” Evan said, getting a good glance at the man behind the door.

And it was in fact Dr. Harris at the door, recognizable only from the neck up. Looking down, Evan was surprised to see a rounded pot belly pushing heavily against the buttons on his tight salmon colored shirt that wasn’t there the last time he saw him.

Dr. Harris didn’t say anything, only awkwardly glance at Evan as his left hand generously thumped the side of his belly. “It appears that there were some… sexual side effects of my enzyme that I was unaware of.”

“Oh really?” Evan said amusedly, suddenly aware he was standing in front of his fattened professor completely shirtless, his own belly exposed for him to see.

“So pretty much, you did this to me,” he said in his usual awkward tone that Evan loved.