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Author's note: This story contains sexual situations between two males. If this his either offends you, or is illegal in the place in the world you lie in, please do not continue reading any further. The author assumes no responsibility of the reader's desire to get off while reading this story, or the mental anguish or legal responsibilities of those who shouldn't read any further than this.

Nature-Mass: The Beast Within

Written by Alden Gilchist

Part One

It was just another boring day. People passing to and fro along the busy street, and no one came towards the lone store sitting conspicuously in the middle of a residential neighborhood. The merchant inside the shop sighed, wondering why he was told by his previous customer to set up a store there for the day. Especially with THAT item. He stared at it where it sat prominently in the corner of the store near the window.

The name on the opened container was "Nature-Mass," an "enhancement" product meant for men. The merchant was instructed not to read the label on the product, nor what else it was meant to do. What disturbed him more was that it was to be displayed with no protection wards on it, making the merchant scoff at his instruction as he averted his gaze from it. His thoughts then began to question everything from the arrangement - a very generously paid for arrangement at that. Why not protect it? Why place it near his shop window? And more importantly... Why near mortals?

His thoughts were shaken as he heard the door open, a slight jingling of the bells on the door giving it away that someone had opened it. Not really caring, the merchant looked in the direction of the door, and walking in was a young man, probably around the age of twenty or so. The man, or rather, boy based on his youthful appearance, appeared to be from the local collage based on the purple, gold, and white colors of his jacket. His build suggested immediately that he was some sort of jock, possibly from the football team. His short auburn hair shone from the sunlight that came in from the opened door for a moment, enough to make the merchant scowl as the boy entered the shop, closing the door behind him. His cheeks flushed a bit when it hit him how cold the interior of the shop was and quickly placed his hands in his pockets to keep them warm.

"Alright, kiddo, let me guess," the merchant said with a hint of disdain in his voice, "Either you're window shopping, or more than likely, the fraternity you're trying to get into sent you up in here to either cause trouble or steal something."

"Wha? I... N-no!" the boy stuttered, surprised at the merchant's gruff approach. "I was just-"

"Just get on with it, will ya? I may have all day, but you certainly want to do other things, don't you?"

"No, no, that's not it!" the boy stated firmly.

As he approached the counter, the merchant looked at him more carefully. He then started to see something that most people would miss. The way his chest looked was actually off... He quickly surmised that the boy was wearing padding under his jacket, likely football gear, which means...

"Oh... Well now... I think I see why you're here. You've tried everything, and nothing's helped you gain muscle mass, and need something to help out, right?" When the boy's jaw went slack as he stopped short of the counter in shock, the merchant grinned and said, "I'm perceptive. What can I say? I make my living selling things that are most helpful to people. By the way, what's your name, kid?"

After recovering his composure, he replied, "Jonas. It's Jonas, sir."

"Well then, Jonas, you're in luck; I've got just the thing to help you out, and for today only, I've got samples of a shipment I'm to start selling soon. Take a look at that over yonder." The merchant then turns and opens the door to go into the back room as he was instructed by his previous customer. "Remember, take just one, and if you like it, come back and see me about buying more when I stock it."

The boy turns to the item in the window as the merchant leaves the room and approached it. He picked up a sample packet and read it to himself in a low voice.

"'Nature-Mass: Bringing out your Inner Beast,' huh...? What kind of...? Wait..." He turned over the packet to read the list of ingredients, most of which he never heard of. "'Promotes muscle growth with a new type of protein supplement?' Yeah, sure... If I could only read it, then I could research it. Must be in Japanese or something. Still..." He turned around and saw the merchant was still gone, then turned back to the product on display. "'Take one sample packet per day for five days with or without food or drink. Contact a doctor if more than one is taken within one day.' Guess it's been tested."

Without any hesitation, Jonas opened the packet and took out the capsule that was inside. Whatever it was, it was some kind of liquid gel filled with a white substance. After looking it over for a moment, he then swallowed the pill. He turned to leave when he stopped in his tracks. He felt his muscles ache, but it was like a good ache, the kind that one gets after a thorough workout, or after one has been playing a game of football for hours on the field. He felt good. Better than good. Looking back at the product display, and then back to the counter to see the merchant was still gone, he smirked. They WERE sample packets after all, so that means they're free.

The merchant returned to the front of the store as soon as he heard the door open again. He looked, and sure enough, as he guessed, all the samples were gone. Normally, this would upset him, but it was what his previous customer wanted to have happen. However... The merchant's body seemed to shimmer for a moment before he relaxed and calmed down.

"Oh, Jonas... You took more than one. That means you owe me..." he said with a devilish grin, "Guess I'll be sticking around here after all, but my shop is now closed to these foolish mortals at last. No need to keep it visible, much less where someone else can walk in."

Shortly after Jonas left the shop, and while no one was looking, the shop vanished into thin air...

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Jonas got back to his dorm room on campus for Orion University and shut the door. Feeling somewhat tired after running all the way back to the university, he hid the rest of the sample packets within a secret compartment near his bed so that while his roommate was there, he wouldn't find them. Then again, a mathlete wouldn't want to use performance enhancers to build muscle mass, so it shouldn't have been a problem, but for some reason, he felt over protective of the samples. After all, there were only five of them - well, four now since he took one of the pills earlier.

Stripping his clothes off, he retired to bed after putting his clothes in the laundry hamper and putting his football padding in his closet. He laid down in bed to rest for the day, and as he slept, he did not realize that his musk flooded the room, and his flaccid member, a modest seven inches when erect, actually grew to full erection almost right away. However, after doing so, the shaft actually began to grow in size, gaining an inch before going flaccid again. After this happened, Mark, his roommate, returned to the room, and upon closing the door behind him, he was assaulted by the scent of the musk that flooded the room.

"God, these jocks... Don't they shower after they workout?" Looking over at his roommate with his shirt over his face, he grumbled, "And he's passed out like some drunken fool. Better get a window open..."

After Mark opened the window, he sat down and began his regular study for the day for his classes before working on math equations to practice for the upcoming competition. However, little did he know that the window slid closed, and grew accustomed to the stench without realizing it.

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The next day came and went, and Jonas didn't feel much different. Some of the other guys laughed at him, saying he may be some football star from his hometown, but he was a nobody in the university. He showered alone after putting up all the equipment, which took a long time to do, then returned to his room. After a long hard day of both classes and football practice, he wanted nothing more than sleep. However, seeing as it was near the same time that he took that last sample packet, Jonas took another one out and swallowed it, this time while he was nude and looking in the mirror to see the effects of it, though he couldn't explain why he did so naked.

When that familiar sensation hit, he could swear that his muscles bulged a bit, growing outwards some. He flexed his muscles, and this time, he could see that there was some effect taking place.

"It works... It works!" he exclaimed, examining his body in the mirror. "I bet if I worked out more while taking these, I'd be the strongest on the team!"

While flexing, for some strange reason, he reached down and stroked his shaft, shuddering for a moment as he groped himself. It was then that he watched in awe as his cock seemed to literally grow another inch in length, now making it nine inches long, and when he felt himself, he was definitely thicker.

"Holy fuck... This... This must be some kind of side effect... But fuck, like I'd complain!"

The next thing he knew, he masturbated, shooting his load onto the mirror, though what perplexed him was that his thoughts on what got him off wasn't on his girlfriend back at home. It was about his roommate Mark. He shook his head, telling himself that he wasn't gay. He had a girlfriend, and planned on getting married after collage. Disgusted with himself, he cleaned up his mess and went to bed, and once again, his musky scent flooded the room before his roommate returned from studying late at the library again.

"Oh god, not again..." he murmured to himself as he opened the window again. "And there's some new smell in here... What is that? Whatever it is, I should get some air freshener tomorrow."

Afterwards, Mark sat down to study again, once again oblivious to the fact that the window closed on its own again. This time though, he was a bit distracted by the musky scent, especially as his pants grew tight from his own throbbing erection. However, he willed himself to study as such behavior was of the devil, and refused to give in to it.

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Today was great in Jonas's opinion. He knocked through the formation's defensive line more than once and scored some points, even though it was a practice game. However, his teammates told him it was nothing but luck. His coach, however, was impressed, and to punish his teammates, they were made to clean up the equipment today. After a shower, Jonas excitedly returned to his dorm room for the day.

After swallowing another sample capsule, he witnessed his body growing more muscular again, not even caring that his body seemed more hairy than it was before. Not only that, he jerked himself off again after watching it grow another inch, marveling at the fact that it was easier to cum now for some reason. Even though this time was no different than last as he got off while thinking of not just his roommate, but his teammates as well, he began to question if he may be bisexual. Regardless, he cleaned up his mess, and then afterwards, he went to bed, this time not even bothering to pull the blanket over himself, leaving only a sheet to cover himself with as the blanket seemed too warm.

After Mark walked in the room, he sighed when he smelled that musk once again. This time, he felt he was prepared, and set down the bag of air fresheners before opening the window. Before he could grab one of them, he had the urge to use the restroom. Going into the restroom there in the dorm room, he didn't realize he left the door opened as he took a piss. But as he did so, he couldn't help but stroke his own shaft, gasping at how hard it felt, and how right it felt in his own hands. Before he knew it, he masturbated for the first time in his life, splattering his seed into the toilet. Mark was in shock, stifling his sharp gasp of horror at what he just did so as to no wake his roommate. Disgusted with himself, he cleaned up, washing his hands multiple times before spraying the air fresheners all over the room, and setting one down by his desk, not even once looking to see that the window was closed again before he began to study.

*************************************************************************************

Jonas's teammates were surprised with him today. He outran them, outmaneuvered them, and in that practice, he scored multiple points, only getting sacked four times that day. They began to talk amongst themselves that something was wrong, though their coach wasn't going to have anything said about him. Jonas didn't bother to shower as he left in the middle of the players bickering to the coach.

Upon returning to his room, Jonas just let his clothes pile on the floor rather than letting them get placed in the hamper to be washed, and left his football padding on the floor as well. He swallowed the fourth pill, stroking his cock as his muscles expanded more, his body hair becoming more pronounced, turning darker brown in the process. Even as he came, he didn't realize, or care, that his teeth began to flatten, becoming less able to rend and tear meat. In fact, he had been eating more vegetables lately, but he told himself this was part of a healthy diet. This time when he had cum, his cock was still hard as a rock, and he felt so turned on, so he kept going, spraying more of his seed onto the mirror and floor and onto himself until he came three times in a row. Satisfied with how sexy he felt and how buff he was, he got into bed, not bothering to clean up and laying down, his legs under the sheets, leaving his stiff hard on exposed as he fell asleep.

Mark returned to the room later that night, and after closing the door behind himself, he was stunned at the sight. Jonas was sporting a boner, and had apparently masturbated while looking at his reflection. This made his blood boil, but... there was something different this time. His blood boiled not because he was upset, though clearly he was originally. The longer he stared at Jonas, the more his cock got hard. He didn't know why, but he just had to have his roommate. Locking the door, Mark stripped off his own clothing, leaving the slightly tanned black haired boy naked before he approached the sleeping jock.

Something about seeing Jonas naked and hard as a rock stirred something within Mark. An unknown desire to see something new; to see if his Christian ways were correct or not. He sat down next to the bed, carefully creeping over and the next thing he knew, he was sucking off his roommate. Jonas didn't wake, but as he came again, the mathlete swallowing the load, he began to wonder about something. This taste in his mouth... It was the same every morning when he woke up. He began to question if he had been secretly giving Jonas a blow job in the middle of the night when he should have been sleeping. Then again... that would explain why he had been fantasizing about guys recently, getting fucked by them. As a matter of fact, his own cock had grown over the past few days, and he did notice he had gained some muscle when he didn't have any before.

He also noticed that his body was changing. Mark's body was also very hairy as well, black hair growing everywhere, almost like fur, although the color was turning lighter in color, almost a reddish hue. But that didn't seem to matter to him at that moment. All that mattered was this majestic being that was lying down in bed next to him. And that cock... That marvelous cock that was standing proudly in front of his eyes, the tip glistening with cum. Mark wanted it, but before that... He spied the wrapper for the Nature-Mass sample on the floor. He turned and found the secret compartment, pulling out the last packet. After reading about it, he turned and looked at the time. It was after midnight, so it was technically a new day.

Opening the packet and taking out the pill, Mark took it and for some reason, held it over Jonas's mouth. The jock after a moment sniffed the air, then opened his mouth, licking at the pill before it was dropped in his mouth. Jonas's eyes snapped wide open and sat up, surprised at seeing his roommate on the floor next to him. It was then that he swallowed, not even realizing at first that he just took the last pill, but did so because his roommate looked so fucking hot to him.

"Get up here," he commanded as he got up onto his knees, "and present me your ass. I... I just-"

"Fuck me," Mark replied, not just out of answering what Jonas was going to say, but out of need as he got up on the bed. "Please... I don't... know why, but I need it... to feel you inside me."

Jonas didn't waste any more time after being told that, spearing his shaft within the mathlete's virgin pucker, thrusting all the way in so his groin. Mark buried his face down in the pillows and sheets, yelling out in pain and ecstasy at the same time. His hard cock spurted precum from the sudden entry, spreading his ass open for the first time in his life by another man's cock.

It was then that the final sample that Jonas was made to take kicked in. He felt his body getting hotter, and he suddenly came unexpectedly into Mark's ass before he actually reached climax. As he did, the hair upon his body began to spread further, turning into actual fur. His muscles bulged again, and his cock throbbed as it grew another two inches to a total of thirteen inches. But more than that, his ears elongated as his face pushed outwards, turning into a muzzle. At the same time, his legs began to crack and shift, becoming digitigrade in shape. However, his feet began to shift as well, turning into hooves, meaning his lower half was now unguligrade. His head began to throb as well as bone began to push free, and within seconds, he had a full set of antlers. His tailbone also began to throb as well, though all that appeared there was a small, flat tail. It was obvious from his appearance that he was now an athromorphic elk.

As Mark's ass was flooded by his roommate's cum, the seed pumped into him began to change him as well. His hair fully shifted to red, though some parts remained black, and now some became bleached white. His hearing disappeared as his ears migrated to the top of his head before it returned as they grew into points. His tailbone pushed at as did his face, turning into a muzzle, and his tailbone became covered by fur as well, and was extremely fluffy. His fingernails grew sharp, as did his teeth, his body completely changing to that of a canine - a fox to be exact - as his legs reshaped themselves to become digitigrade. His cock throbbed harder as it grew larger, doubling in its original size to twelve inches as the blood rushed into it, turning it deep red as the base of his cock swelled up as it became a knot.

Furthermore, the skin around the base of his shaft as well as that for Jonas began to creep upwards, encasing the base of their cocks. This extra flesh became their sheaths, and their transformations were finally complete. The two rutted some more, until the two reached mutual orgasm, leaving Jonas's bed nothing more than a mess with both of their seed as they both came multiple times before cumming at the same time. Jonas panted hard, his large sack still feeling full and heavy, and even though he really wasn't tired, he decided to finally rest. The fox under him also panted, his cock still rock hard, but decided it was best to stop.

"Wow... that was sooooo much fun, Jonas."

"Mmm... yes it was, my sexy fox."

Mark blushed at the remark. Did he just call him his fox? Does that mean what he thought?

"D... does that mean... you're my boyfriend?"

Jonas grinned at the remark, and thrusted into his him again for emphasis. This elicited a moan from the fox under him, a small spurt of pre shooting out of this tapered cock tip into the pool under him. He clenched his ass around that invading cock, making the elk grunt and shoot another spurt of precum into the fox.

"Heh... That's enough for now... don't... you think...?"

"Huh? What's wrong?"

"Is... is that us?!" Jonas exclaimed as he looked into the mirror.

Mark looked, and was shocked as well. They were different. They weren't human anymore. They were some kind of animals that looked human. How can they go outside their room like this now? It was then that the image in the mirror shimmered. What reflected wasn't them, but the merchant he saw before at that shop, though his head was looking down at the ground as he laughed a bit, shaking his head at them, his face covered by a hood.

"My, my, my... Such naughty animals, rutting about in the middle of the night like nothing is wrong with either them or the world around them. But please, do keep your voices down." The merchant looked up, and the face wasn't human. The merchant was some kind of demon. "No need to draw attention to yourselves. Or do you like attention?"

"Wh-what did you do to us?" Jonas asked, keeping his voice down so that he didn't accidentally wake up anyone else in the rooms around them, or alert anyone who may be out in the hallway.

"Me? Why, I did nothing to you. You, however, did this to yourself, and to him when you took those sample packets that I suggested you try out. Not only did you take all the sample packets, you also used all of them."

"No I didn't! I have one more that I haven't used yet!"

"Um..." Mark said embarrassed, "Actually... I found it and gave it to you before you woke up..."

"Wait, you did what?"

"But come now, children. I came because the person who wanted me to promote that product wanted to speak to you."

The two looked up as the image changed. Instead of the hooded demon merchant, a naked man stood there in its place. A muscular, sexy man with a fully erect shaft, his lower half appearing to be something like that of a goat, and a tail that slithered behind him almost like that of a snake. Although the spade at the tip was opened up and a tailcock was protruding from it. His tongue was also split on the end like a serpent's, but instead of being of normal tips, there was instead a pair of hemipenes. All of his cocks were leaking precum from them.

"Well, hello there, darlings! It seems you've been taking my special supplements!"

"Who... are you?" they asked at the same time, the elk still fully hilted inside the fox under him.

"Oh, dearies, don't you know? Never ask a demon his name. Besides, it's not like I'd give you anything closely related to my name, so... just call me Lust." He sneered as his cocks leaked more pre. "So, if you do as I say, I'll purchase a glamour from the devil merchant for you. It will hide your true forms from others... for a while at least. If you want a more permanent one, you'll do exactly as I say."

"Wait a moment," Mark said, then asked, "Those supplements that you've given Jonas to use... What are they exactly?"

"Those? Oh... well... You've enjoyed his taste, but he's had a taste of me, so to speak. Although I did use a bit of magic to enhance it to have the desired effects. Any other questions? Or would you like me to... open the door for the next person that passes by?"

The locks on the door were suddenly released. In addition, the door handle started to turn.

"N-no, stop!" Jonas said, "J-just tell us what you want from us!"

"Good kids," Lust replied, locking the door again. "My price is for you to spread your 'condition' to others. A large number of others in fact. And the number must be satisfactory. If not, your appearances will be revealed to everyone to see. And you don't want that, do you?"

"No... no sir..." Jonas replied, "But with the football game coming up, I'm not sure how-"

"That's it!" Mark replied. "The football game! Its a few days from now, and there will be lots of people there!"

"Hey, are you crazy?!"

"Nope! I've got a few plans that we can use." The fox grinned deviously.

To be continued...?