“Hey, can you give me a hand in Aisle 3, flatso?”

Psi turned around quickly to glance at who said that, but all he saw was a faint trail of lengthy, snow-white unicorn tail hair disappear several aisles away. “Come on, Vesryn, knock it off,” the ferret whispered to himself, blushing for the fifth time that day. His red cheeks were easily visible through the cream-colored fur on his cheeks, and the slinky mustelid could barely keep his bushy tail from bristling with excitement. 

Vesryn. Psi’s friend, and co-worker, had taken it upon himself to point out how tight and diminutive the ferret’s rump was every single day that week. The nicknames just didn’t stop: flatso, flatty, ass-less, thin-cheeks, and so much more.Sure, the slate-furred ferret had a figure that was primarily thin and feminine, to the point where some of the customers would mistake him for such from behind, but that wasn’t the point.  It was starting to get a bit out of hand, not counting the incident the night before when Vesryn called him out, by name and badonk-less status, to the rest of the health food store.

“Sssssh! Vessy, come on,” Psi hissed through his teeth as he gave his pal’s chubby arm a playful tap. “You win, already! I’ll come over to your place, just knock it off with the names, please. You’re going to make me burst a few blood vessels in my cheeks at this rate.” The ferret looked past the unicorn’s golden muzzle, staring into the deep, blue oceans that were Vesryn’s eyes, hoping for a little bit of understanding.

A smile slowly crept across Vesryn’s lips, finally nodding in approval. “That’s fine by me,” he replied, while pretending to arrange the shelves to make his request for help look more reasonable. “We’ll both go back to my apartment after your shift ends. I’m done an hour before but I’ll wait around for you to wrap up. I’ll make sure that you like the extra pounds I’m going to give you, okay?”

True to his word, Vesryn waited patiently for Psi to wrap up his duties inside the store. The sun was barely starting to set as his friend strolled out the sliding door in the front. If it were up to him, the unicorn would have wrapped his arms around the stick-like ferret and hugged him with all of his might until his lengthy braided alabaster-hair swung all around his pink self in glee. Despite Vesryn’s few hundred extra pounds and curves compared to his friend, the unicorn was still a little bit shy around the mustelid. Working together for nearly two years would normally fix that feeling, but in that time the equine developed quite a crush in private. It had been weighing on his mind ever since.

The two walked back to Vesryn’s place, which was only a dozen blocks away from work. They passed the time with idle chatter about the weather, what else had happened during the last hour of Psi’s shift, and about all of the jerk customers they had taken care of. A few flights of stairs and one locked door later, the duo slipped into the unicorn’s apartment. It was sparsely furnished, for the most part, probably due to Vesryn’s own girth. Still, the living room had all of the modern conveniences befitting a 20-something guy, with a nice entertainment center and all and oversized coffee table, still laden with a few bags of junk food. The ebony microfiber couch was quite gorgeous though, and twice as long as a typical one. A slight indent was stationed right in the middle, presumably where the pink equine parked himself at night to relax. 

“Make yourself comfortable, Psi!” Vesryn was more than happy to lead his friend in before locking the apartment door behind him. 
“Um, if you don’t mind, how about we get you all sized up first, then call in something for dinner?”

“Yeah, that sounds good to me, so long as I get to pick the place.” The ferret glanced at his friend’s kitchen, spying a few menus laying across the otherwise-immaculate marble countertop. “May as well get this over with, though. Where should we do it, and do I get to keep my pants on?”

Vesryn took stock of the apartment for a brief moment, eyeing the walls and then looking quite lost in thought. “Just to be safe, better off doing it in my bedroom. There’s slightly more room in there, just in case.” With a flick of his arm, he motioned for Psi to follow him down the hallway to his room. His tail flicked to-and-fro with anticipation, sighing happily to himself as he ushered his friend in towards his somewhat-private room. He hadn’t expected the ferret to give in so soon, but at least he forced himself to clean up most of the apartment before heading off to work that morning. “And yeah, it’s better to at least take off your jeans, but you can keep your underwear on.”

The unicorn had to work hard to get that last sentence out without stuttering. His heart skipped a beat at least three times over, by his count.

“Oooh, the bedroom,” Psi winked as he walked by his friend, “If I knew it was going to be this intimate I would have brought a condom.” Psi made a spectacle of himself, swishing his hips in an exaggerated manner as he approached the foot of Vesryn’s massive king-sized bed, patting along the front edge of the blanket. “Just kidding, though. You’re not going to see much through these, anyway. I’m too FLAT, if I recall.” 

Silence filled the apartment, save for the slow descent of a zipper and denim hitting the carpeted floor. Psi, having forgotten the proper undressing order, squirming a bit as he leaned forward on the bed to get a better angle for kicking off his sneakers. It proved difficult, causing the ferret’s tight rump, which was facing outward towards Vesryn, to squirm about in place, with tail raised high. Even though it may not have been that much to look at and thoroughly draped in black cotton, the unicorn held back the urge to comment. His voice was likely to crack if he even made an attempt to do so, anyway. 

“Should I keep leaning over like this,” Psi inquired, as he finally slid his shoes off and kicked his jeans to the other side of the room in triumph. “Or is there a better way for me to stand or sit myself for this spell?”

“You can stand like that forever,” the equine mused internally, thrilled with the view even if it wasn’t up to his usual proportional tastes. Still, he was given the honor of adding quite a few pounds magically to that derriere, and Vesryn couldn’t have been more honored. “No, that pose, er, position is just fine, Psi. Just face forward and get ready. There should be some warmth and tingling in a sec back there.” 

The ferret laughed a bit, trying to force back his usual fit of blushing. “Just don’t take too long, or else I’m going to think your ‘spell’ is just another name for your dmmmph!”

The enchantment kicked in right as the ferret was about to finish his quip. Vesryn was pleased all of those years of training had allowed him to cast these simple expansion spells without speaking, especially as that reddish blush deepened on Psi’s cheeks. The increasing heat and prickly sensations that Vesryn described were quite apt, and the ferret felt every single one of them along his two cheeks. It was as if several people were gently scratching at his rump with the tips of their claws, as if examining their curvature through contact. The increasing temperature back there, while awkward, was more akin to sitting in front of a roaring fire after spending hours shoveling snow; constant, roaring and rising heat, but ever so soothing.

While Psi moaned lovingly into the bedspread without even realizing he was doing so, Vesryn bit his lower lip at the sight. Slowly but surely that ferret’s pert rump gained a pound here and a pound there. It swelled slowly from having no definition at all to far more detail. At the start, the unicorn could barely discern where each of Psi’s cheek’s started and ended in those boxers of his. After a few minutes, though, he had gone up a size or two, to the point where he could easily see his crevice between the buttocks. Each side grew slowly, becoming more and more rounded and melon-like in appearance. Even with their additional heft, though, they still remained almost as rigid as before, to the point where one could bounce a quarter off of it.

As much as Vesryn wanted to test that out, he just stood there in the doorway and continued to stare at the sight. Both cheeks swelled all the more, filling up those boxers until the waistband above started to hug into Psi’s hips all the more. The additional pressure only made the ferret crescendo with his unintelligible cries, and from the way he was grasping at the covers on the bed  he looked quite happy that he had come. His friend, fascinated by his handiwork, thanked any number of deities that the scrawny mustelid happened to wear underwear with the most potential give today. It mean he could easily slip another extra ten, twenty pounds onto those globes of his without any feeling of guilt.

The seams in the cotton boxers were slowly starting to strain, though ,against all of the additional heft. His caboose was easily three times larger than it was before, to the point where Psi would aggressively have to jam his seat into all of the chairs at work in the break room, or even at his own apartment, just to be able to barely sit down. What used to be barely a single foot wide of rump was now expanded to a solid three feet and change, so much so that the boxers strained to keep on his body. The ebony material had long started to slip into Psi’s crack, forcing its way further in, as if it had to caress along the ferret’s taint as It was its final wish in life.

Slightly distracted, Vesryn stared at the sight as the ferret’s chestnut-furred cheeks came into view, bursting out of the last piece of clothing adorning his lower half. They jiggled in place from the force, so much so that it seemed unlikely they would ever stop. Psi yelped out in surprise and glee, all the while his friend lamented not having the foresight to set up his phone to record the entire event. 

Psi’s hands gripped along the blanket some more as he still felt the heat in him growing. “A-are you almost done, Ves? I-I don’t know if I can stand like this any longer.” After some silence, the ferret realized a reply was not exactly forthcoming. “Um, Ves? Hello? W-when is this spell going to stop?”

“VES!!!!!”

Needless to say, unicorn minds were certainly elsewhere. His tail was wagging behind him, all two feet of glorious, ivory mane swishing about in happiness. Being an equine who weighed as much as four times what his ferret friend did when he began, he had lost his train of thought once that auburn ass of his grew to the same size as his own, wider than most standard door frames. Vesryn toyed with the thought that Psi had to sleep over here tonight simply because, as memory served, that door frame into the ferret’s own apartment wasn’t nearly as accommodating as his own. In his mind he could see his friend struggling with that frame, grunting and pleading with it. Vesryn envisioned each of those cheeks, as massive as a big-screen TV apiece, quivering and quaking like gelatin as they were thrust into the entryway, only to squirm in place and deny Psi’s back half of his body from resting at home. Other people passing by in the hallway would just notice a massive chunk of ferret sticking into the hallway, a blubbery butt that would take either twenty people ramming themselves into both of the stupendous curves to get him in, or the jaws of life in order to get the rest of him back out.

“EARTH TO VES!! WHAT ARE YOU DOING BACK THERE?!!”

The salmon-furred unicorn blinked a few times and snapped himself out of his daydream. By the time his vision refocused he understood the ferret’s distress, as he glanced at what only could be described as a mountainous sight. Both of Psi’s cheeks were sagging along the floor, but also were barely a foot away from scraping against both walls of the bedroom, as well as the ceiling. It shimmered with intensity, and as Vesryn reached out to poke it, felt the entirety of his finger just sink into that plump cheek with ease before pulling it back out. Psi was practically carrying around two humongous waterbeds as an ass now, with enough space to potentially, and comfortably, let the entire forty co-workers at their store sleep on them. And with a little extra room left for stretching out, too.

“I…I…don’t worry, I’ve got this under control!”

“I HAVE A FEW DOUBTS ABOUT THAT!!” Psi was a bit inconsolable, to say the least. All he could envision was being stuck in that room until the size of his backside was so massive it started causing the rest of the building to lose its integrity. It may never have crossed his mind before, but being crushed by any ass, let alone his own, was seeming like a distinct, embarrassing possibility. 

Vesryn, thinking fast and on his hooves since being refocused, shrugged off his friend’s worry. “Just start turning around in there and make your way to the door! Don’t worry about my stuff, break it all if you have to!”

Panicked beyond reproach, Psi started to turn around like his friend suggested. In doing so he could hear the mattress squawk as the metallic springs couldn’t deal with all of the extra weight. They may have easily supported Vesryn’s hefty body all night long, but there was just too much ferret for the hundreds of springs to handle. Wood crunched, glass cracked into spiderweb patterns, and standing furniture descended slowly to the floor, getting caught up in the flab in Psi’s new ass-based heft.
“Almost…there,” he huffed, right before twisting a little bit more and staring at his friend once more. Psi’s face was reddened from exhaustion and anger; Vesryn’s cheeks were all flush from equal parts arousal and embarrassment.

“Alright, one more spell and you’ll have nothing else to worry about, okay, Psi? “ Vesryn reached out his arms to hold his friend, but the ferret grimaced and stood there for a moment. With a reluctant sigh that seemed to get out most of his anger, the ass-laden mustelid nodded and put a small smile on his face, before stepping forward and embracing. He struggled a bit, since the rest of his rump had finally reached the point where it was pressing on all of the corners of the room at once, but he held on tight.

“I trust you, Ves, but just stay focused this time, alright?”

*****

“How many strips of bacon do you want, Psi?” Vesryn called out as he worked his multiple frying pans on the stove. He had a good two pounds of the cured meat cooking at once, and it was the least he could do for his friend for staying the night.

“Hmmm…can you give me a full pound of it? Your spells really upped my appetite,” the ferret called back from across the apartment. He sounded happy enough, at least as much as one could after a mishap like that. Still, they had spent the night together, relaxing and marathoning a few TV series and all, catching up on personal things and love interests, all the usual fun stuff. 

Vesryn, for his part, didn’t come out and say that he had a crush on Psi, but he did lead on more than enough to let slip that he wanted to help enhance his butt for a particular reason. Not necessarily for his own gain, of course, but so he could show others how gorgeous a ferret he was. The compliment easily drove out any remaining anger he had been storing from the incident not a few hours prior, and Psi showed his appreciation with a soft kiss.

The unicorn, finally taking all of the pans off of the stove and plating, sauntered right out of the kitchen to the awaiting ferret. Psi, thrilled at seeing such a massive portion of crispy and limp bacon alight, reached out a bit for his plate, only falling an inch short. 

“Um, come on, don’t tease me like this,” the ferret whined, still struggling to grab for the plate.

Vesryn sighed and leaned over just a bit more down the hallway, just to slip the rim of the porcelain plate into Psi’s grip. “Sorry, I had to. Besides, I’m sure I’ll figure out the rest of the reversal spell today, maybe tomorrow at the latest. We have the weekend off, anyway.”

The second spell was not so much of a cure as it was a preventative measure. While losing his focus on the initial growth spell caused some aspect of it to go wrong, the unicorn realized he’d have to go back into his books and study it again in order to enhance the counterspell enough where it could deal with the literal extra tons of fat in Psi’s ass. In the interim, though, he was able to temporarily enchant his room to be a gateway into a pocket dimension Vesryn had control over. His actual bedroom, despite the destruction inside, would be just fine and structurally sound; The back half of Psi, on the other hand, was waiting, and still growing, in the vast, uninhabited plains of some other place entirely, reachable only through magical means. 

It also had the added benefit of Vesryn being able to slip away from his friend, who was still caught in the doorway to the equine’s bedroom, cast a similar spell on his hallway closet, and slip in well behind the ferret so he could take pictures of the ever-continuing growth, as well as take movies as well. For his own personal enjoyment, of course. And the fact that the cheeks themselves moved well beyond “hill” status and were closing in on being true mountains? All the better.

“You’re right, I know,” Psi murmured as he snapped into a few more pieces of crisp, smoked pork. “And at least you keep all of your magic books under the TV in the living room, so no worries about it being stuck in the bedroom under both me and the dimensional spell!”

“God, could you imagine if that happened? Talk about horrible luck!” Vesryn turned around and started back down the hallway towards the kitchen. “I’m grabbing an orange juice before I sit down and eat with you. Do you want one, too?”

“Sure, but don’t take too long, or I’ll probably ask you for another pound of bacon!”

“You could, you know. I’ll fatten you up yet!”

Psi, blushing out of sight, yelled back. “I thought we both discussed that that didn’t entirely go to plan the first time around!”

“Yeah, but that was magic. Why not try it the old-fashioned way, too?”

Vesryn kneeled down in front of the fridge as he tried to fish out the container of orange juice from the back. His own ass rubbed up against the wall, and that only brought his memory back to Psi’s as it kept on growing, from nothing at all to everything in the world. He hated to keep things a secret from his friend, but there was one thing he had not yet mentioned to the ferret when it came to the counterspell itself.  Could the unicorn figure it out within the weekend? Sure, more than likely before dinner that day, at the very latest, not even counting Sunday. However, figuring it out early wouldn’t be nearly as fun.

This way, at least Psi would stay over for the weekend. It was a tad manipulative, but, truth be told, at this rate Psi was going to hang around anyway, especially after all of the fun they had, even after the miscast spell.

The real reason was that there was a slight kink in the workings of the counterspell itself. It would work exceptionally well, no doubt about that, but there would be some sense of permanence to it. Nothing much, of course, just a fraction of a percent of the growth itself. Even if Psi’s rump would wind up being a few dozen miles long in the pocket dimension a successful counterspell would knock it all down to a few inches of growth, at best. A nice bubble butt, at least, and far harder to work off than typical weight. 

But if he stayed the whole weekend? That backside would be quite plump, almost nearly as impressive as Vesryn’s own. And, as much as Psi never admitted it, Vesryn saw the face the ferret made as he popped out of those boxers. If he loved it that much, just another few sizes above that impressive girth should be heaven for him, even secretly.

Vesryn sighed with delight as he shoved the container back into the fridge, having poured out two glasses of the orange juice, and started to make his way back down the hallway to rest with his friend. Doting on him was fun, after all, and they were bonding all the more. Besides, Vesryn made a silent promise to himself when they first became friends, that he would always try to give Psi whatever he really wanted. It worked out perfectly for holidays and gifts, and he knew his friend felt the same way, considering what he received in kind. To that end, why not give the ferret the ass he always wanted? Psi would win, most assuredly, and he himself would have the pleasure of staring at it almost every day at work. And maybe, just maybe, the pleasure of seeing it in the nude again, and in his bedroom.

Sunday night and the counterspell’s side-effects couldn’t come soon enough.