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(This story contains male WG, muscle growth, and height growth. Also M/M non-explicit sexual situations, and body hair/beards.)
Experiment Report 2D342-9G
Challenge: The forest surrounding the colony on R-237 were comprised of a truly gigantic species of tree. The average representative sample was 14 meters in diameter, and over 350 meters tall. At this size felling from the base was deemed too risky, and the use of any sort of flying machinery to harvest from higher up had its own dangers.
Solution: It was decided the safest option was to use human labor to climb up and cut manageable sections of the trees down, modifying the labor genetically as needed. Candidates were selected and brought to the colony.

The two clean-shaven men of average build stepped off of the shuttle, duffle bags over their shoulders. Looking around, one of them said, “I thought it would be bigger.”

The other laughed and replied, “Heck, Jim, what were you expecting, a metropolis?”
“Well, maybe not that big, Nick, but I didn’t expect to be able to see both sides of the dome from the same place.”
Nick looked and could see his friend was right. “Well, in any case, we better hustle or we’ll be late.” He quick-stepped toward the building with a sign that read “Genetic Research” and Jim followed.
Once inside, they were shown where to leave their things and then led into a sterile-looking room. A woman with glasses and a lab coat looked at them and then consulted a datapad. Looking up at the two, she queried, “Nicholas?”
Nick raised his hand and said, “Uh, Nick. Hi.”
Looking at the other man, she said, “James.”
Shyly, Jim replied, “Uh, Jim?”
Making notes on the digital pad, she continued. “I am Dr. Xiu. I will be overseeing your examinations and treatments. I am also the point of contact should you have any questions. Yes?”
Nick put his hand down and said, “Could go go over, like everything? I mean, all we were told was that there was work on one of the colonies, tree-cutting, and that was about it.”
Dr. Xiu sighed, collected herself and then explained. “You are here to harvest lumber. Did you see the trees when your shuttle was coming in?”
Nick replied, “Um, actually, no, I was asleep.” Jim gave a nod in agreement.
“Well, they are big. Bigger than any species of tree we’ve encountered. The best way determined to harvest the wood is to have humans climb the trees and cut the tops off until it is short enough to cut from the ground safely. Power machinery would lose charge too quickly, so rather than have each worker carry up 200 kg of power supplies, muscle-powered hand saws will be used. Yes?”
Nick again. “Um, have you seen us, over here? We wouldn’t be able to use a saw for ten minutes, even if we could make it up there.”
Dr. Xiu sighed. “Please, I was about to address that. In order to make it possible for you two to do this job, certain genetic modification treatments will be necessary. Please put your hand down. Thank you. These treatments will have the end goal of making the subject taller and significantly more muscular, as well as increased lung capacity to handle the slightly thinner air more ably. We plan on accomplishing this with a minimum of side effects.”
Nick exclaimed, “You’re going to turn us into muscular hunks? Sign me up!”
“You are already signed up for this. As well as having committed to working in the forest harvesting wood for no less than four years.”
“Well, yeah, it was just an expression. I guess I should have said, ‘Well, let’s get going!’ Either way, let’s get going!”
Jim just nodded in agreement.

The procedure worked well first two subjects, with no apparent negative side effects. Each had grown over a foot taller, and their muscle mass increased over 400%. The only unforeseen effect was the increased growth of facial hair, necessitating the subjects to grow beards rather than shaving twice a day. Once the physical changes were complete, the subjects began their physical training alongside of the other education they’d been receiving pertaining to their job. Once training was complete, they were assigned a work shift to begin harvesting.

“Timber!” Nick yelled as his saw went through the trunk of the tree, and the top piece fell hundreds of meters to the ground below. As he watched it hit the dirt, he yelled to Jim, “I think I used to be afraid of heights! I guess the treatments took care of that.

Jim looked at the Mr. Universe levels of muscle on his friend in the nearby tree. The experiment seemed to have worked wonders, turning them both from scrawny runts to muscular adonises. They sprang up from about 175 cm in height to over 220. Every muscle on their body was huge now, and they now sported neatly trimmed beards. He yelled back, “Yeah, I guess it wouldn’t make sense for a tree harvester to have acrophobia. Or agoraphobia - I never was a fan of spaces that were too open. Timber!” As he talked, he had continued sawing, never once becoming out of breath.
After their shift, they pulled the wagon loaded with huge logs back to the colony gate. Once they dropped off the wagon and their equipment, they walked through the town. Though they’d been out of treatment for two weeks, they still occasionally got stares, mostly of amazement, but some downright lusty ones from a few women.
They got to the dining hall, and retrieved their trays full of food. Finding seats that didn’t creak too much, They sat down and ate every ounce of their huge meals with gusto. Once they were done they went to their bunkhouse.
As they lay there in the darkness, Jim said, as quietly as ever, but an octave lower, “Nick?”
“Yeah, bud?”
“This is a good life to have.”
Nick smiled. “You’re right. Good night, dude.”

It wasn’t until after the first two months that the initial side effects of the treatments started to show. The subjects started another growth spurt, both in height and mass. Since this only seemed to make them better at their jobs, no alarm was raised at the time.

Nick pounded on his buddy’s door. In a deep bass voice he said, “Jim, dude, are you ready?” Receiving no answer, he opened the door to see Jim quickly covering himself with a blanket. “What’s the matter?”

Jim reluctantly lowered the blanket to show his torso and stood up to his full 250 centimeter height. His six-pack was gone replaced by a belly that was just starting to hang below the band of his shorts. His massive pectorals had acquired a layer of softness that rounded them out just a little. “See? I’m not hot anymore. To women, I mean.”
Nick smiled and lifted up the loose shirt he had on to reveal his midsection and chest were in the same state. “This happened to me a couple days ago. Why do you think I’ve been wearing loose stuff? So it’s fine. I’m sure it’ll catch up if we get any taller.”
Jim brightened, “Hey, yeah, maybe!” He put on a shirt that was loose like Nick’s, and they went out to work, ducking under the doorways as they went.

In the next several weeks, the side effects worsened, causing growth spurts that came suddenly at random intervals. Also unforeseen was their increased tolerance of cold temperatures. The two subjects became too large for their assigned quarters, and had to be moved to the warehouse where the lumber they harvested was stored.

Jim sighed as he put on a shirt that that barely covered a belly that stuck out more than half a meter and hung down to cover his crotch. Even though he’d grown to a height of a little over three meters, his belly had always gotten bigger relative to his new height. He’d also gained considerable amounts of muscle, which still showed on his arms and legs despite the increasing layers of flab there. His pectoral muscles had made his breasts look even bigger, rounded out and beginning to rest on his belly. His beard had also gotten thicker, and although it hid his double chin, it was very unruly and brushed the tops of his moobs. He sighed again as he straightened the shirt as best he could.
The loud sighing attracted the attention of his friend Nick, who was already reaching four meters tall and had even more muscles and fat than Jim did. He strode over, his massive shirtless hairy belly jiggling, and asked, “What’s the matter, buddy?”
“Well, I was just missing back when we were lean muscular hotties who had the eye of all the women here.” He looked down at his body and sighed again.
Nick moved closer and said, “Well, you’re still muscular. And I’m sure some folks find you hot.”
Jim scoffed, “Oh yeah, who?! Um, dude why are you so close…”
Nick leaned down and kissed his friend. He pushed his larger belly against Jim’s and as they backed against a wall, their lips parted and Jim said, “I don’t understand…”
“Dude, I’ve having sexy thoughts about you since you showed me your belly that one day. As you got bigger, the thoughts - and you - have only gotten sexier.” He kissed Jim again and put a hand on one of his moobs.
Jim blushed bright red as he moaned his pleasure at Nick’s touch. He gave one last gesture of feeble protest before giving in and letting Nick kiss him again. He’s never been attracted to men before - maybe this was another side effect.
Just then, Jim felt a warmth over his whole body. As Nick was groping him, everything just started getting bigger. He was entering another sudden growth spurt! Nick just smiled as the folds of belly and moobs he’d been fondling got bigger in his hands. Jim felt his shirt and pants get tighter as his belly and ass took up more and more room. The shirt rode up every time Nick moved his hands elsewhere. Soon it was holding his breasts like a bra, one that was about to give up. Then, almost as one, his shirt and pants ripped along seams and fell off.
In the end, Jim was about as tall as Nick now. His belly hung even lower, and his moobs lay heavily on it. Jime sighed and said in an even lower voice, “That was my last shirt.”

The growth spurts increased, both in frequency and in the amount of growth. At this point the subjects were completely immune to the cold of the outside, which is fortunate, since they had outgrown the warehouse and moved to a campsite outside the dome. Another side effect has been drastically increased libido directed at each other, even though one subject had indicated heterosexual orientation on his form. As their attraction to each other has increased, their productivity has diminished. In addition, the fat accumulation on their midsections has made climbing trees more difficult.

Nick rolled over as he awoke to birds chirping. That is, he tried to roll over, but a large hand was clenched to his huge moob. He sighed remembering last night. He actually sort liked it when Jim’s growth spurt occurred first, because then he was more take-charge. While Nick was about 14 meters tall, Jim was 17 meters, and that made everything significantly bigger. Everything, he mused as he tried to work a hand behind him and under Jim’s belly. Finding what he was looking for, he determined that Jim was ready to go again despite being asleep.

Soon Jim stirred and released his grip on Nick’s breast. Smiling at what Nick still had a hold of, he said, “Couldn’t get enough last night, huh? Well, we’ll see whether you can this morning.”
Looking at the sun, Nick said, “The sun’s already pretty high. Maybe we should do some work.”
Jim laughed. “I’m about to do some work! Come here!”
After their morning session, they stood and got their equipment on. They both were naked except for sturdy belts that went over their butts and under their bellies. Even with this in place, Jim’s gut hung to his knees, while Nick’s went about three-quarters of the way. After checking each other’s equipment to make sure it was secure, they walked a short way to the empty wagon and started their climbs.
While Nick was still able to climb fairly well, Jim couldn’t without rubbing his enormous belly against the tree trunk. By the time they finished and were back on the ground, his entire gut was red and sore.
Seeing this, Nick said, “Let me take care of that,” and went back to camp to find a tube of soothing lotion. He put some in his hands, and began to gently rub it onto Jim’s gargantuan belly. He could feel the heat dissipate and knew it was working. Once he was done, he wiped his hands and put the tube back.
“Hey, Nick…”
“Yeah, buddy?”
“All that rubbing, there’s something else you need to take care of.” In case it wasn’t obvious, Jim lifted his belly to show him.
Smiling, Nick walked back toward his for-now taller partner, knowing they’d be lucky to get the lumber wagon back to the dome by sunset.

As the weeks proceeded, the subjects continued to grow - in height, girth, and strength. At one point their relative midsection fat accumulation made it impossible to climb the trees and harvest the wood. The experiment was closed as a failure and other avenues of harvesting were proposed, though none made it past the discussion stage. Meanwhile, the subjects had moved off into the forest, never to be seen again. That was, until one morning months later, a larger quantity of wood appeared at the colony gate than ever before. Review of the security video showed nothing but huge bare feet and the lumber being set down.

Nick cut off another log from the felled tree and put it in the pile with one hand. At 60-some meters tall, he and Jim were able to wrap one hand around most of the tree trunks. They were also strong enough to cut them at the base and bring them down safely, so that the entire tree could be cut and used. Each tree took several days to cut into timber, but they were able to cut enough to drop off at the colony in half a day, leaving the other half for their own activities.

Jim put another log on the pile and declared in a booming voice, “That’s enough for today.” He scratched his big hairy belly that hung down past his knees, just as Nick’s did. He took Nick by the hand and lead him back to where they slept.
After several hours of pleasuring each other, it was well into nighttime. They got up and divvied up the wood pile. Carrying the timber under their arms like twigs, they reach the colony. As quietly as they could, they deposited the wood by the gate, and waddled off, actually having to be cautious of getting stuck between the trees.
As they lay down for the night, they kissed, and said good night. Jim sighed and said, “Thank you for talking me into this, Nick.”
Nick smiled and said, “You’re welcome dude.” As their fat hairy bellies settled into each other, the pair drifted off to sleep.