“I’m familiar with most of your donuts, but what’s so special about this new one?” Psi stared at the confection in his hand, inspecting every bit of it while he rested in the kitchen of Arai’s Bakery.  

The effeminate ferret had been called down there first thing in the morning, and even the sun was a few hours away from rising across the horizon. His cerulean eyes were as glazed over as the donut in his paw, feeling some of its icing drip onto his copper-furred fingers.

Vynx leaned against the wall next to one of the two gigantic stand mixers. “It’s one of Arai’s new prototypes, actually. My sugary treat over here wanted to see if they were as tasty as they were effective, but he wanted to make sure it was a success first.” The sabre-toothed Iberian lynx beamed from ear-to-ear, obviously proud of his boyfriend’s baking prowess. Psi was pretty certain that the feline had his tan, spotted hands involved in this initial batch, too, giving him all the more reason to be proud.

“Awww, thanks, love! Anyway, Vynx is going to watch to make sure it all goes according to plan from behind while I keep eyeing the recipe, as well as your front.” Arai was wagging his tail with such speed that it would make a hummingbird in flight look lazy by comparison. These new experiments always delighted his silvery countenance to no end. The fact that most of his body, from the pudgy belly, the hips wide enough to body check an SUV, and genitalia that could flood a room, could have been a much-enjoyed side effect from his own confections was just another measure of his baking prowess.
“Just eat one for now and we’ll chart the progress, Psi,” Arai coaxed. “Just do your best to describe the flavor, okay? Don’t worry about anything else.”

Struggling to remain awake, the nude ferret nodded in acceptance and took a large bite out of the treat in his hand. Given that Arai’s shop had the tendency to create some growth in the physique of customers later on in the day, it was always a good idea for testers to disrobe first before anything else. Psi would have considered it strange but both Vynx and Arai were close friends; Both the feline and canine had seen the slinky mustelid in the buff several times before.

“Well, the taste starts out strong, but it’s a bit different than most of your other donuts.” Psi stood there and contemplated before he took another large bit, already finishing off half of the pastry. Some of the excess purple-swirl icing seeped down onto his eggshell-colored chest in long strands, but he shrugged it off. “Icing is a bit more gooey than your other varieties, but it’s really flavorful. I’m guessing raspberries mixed with either lingonberries. Maybe pomegranate?”

The ferret stood facing forward towards Arai while his free hand started to lean against the prep table in the middle of the floor. He was still feeling a bit woozy from lack of sleep the night before, but Psi didn’t want to rush the process, either. He just knew he had to hold himself aloft or else he was liable to pass out, possibly throwing off the sale of the new donuts by another few days. He couldn’t do that to his friends.

“From the texture and look of the donut itself, I’d say you went with a yeast approach, which works really great with the icing.” He continued on about the density of the object itself and other details, but Vynx was more fixated on Psi’s backside. 

Even from a few feet away the lynx was really glad that they had Psi take off his pants beforehand. At the beginning his cheeks were as tight as a drum, but they were expanding at quite a stellar rate. While most customers would go up a few pant sizes by the end of the day thanks to the slow reaction, this was quite the opposite case. He had barely begun to critique the glaze before he reached what would have been a seat-splitting size for his jeans, sporting a butt more appropriate for someone at least a 100 pounds heavier than he, if not 150.

For whatever reason, Psi didn’t seem to notice anything happening along behind him, save for the sensation that he needed to old himself up. It was like his senses back there were dulled, but the results couldn’t be denied. Vynx shot Arai a large thumbs-up in approval as that ferret ass bubbled outward to glory. It was as if the yeast cultures seeped right into his cheeks and started reacting with the heat found there. Ever several seconds they inflated all the more, adding on another inch and a half of rotund pudge as if someone were filling up each buttock  with a massive breath, just like a balloon.

To his credit, Arai quickly found himself having a bit of difficulty keeping up. His pal was right in front of him, giving him some solid feedback as to the taste and design, but the view was growing far too difficult to ignore. By the time his cheeks grew so wide his thighs and calves puffed up to support them, the view from up front left nothing to the imagination about what was going on behind. Psi had grown to the same size as Arai’s own hips, and the husky daydreamed for a moment about giving that booty a proper bump when they were all done. He even mistakenly jotted that down on his notes in front of him.

By the end, though, that ass surpassed the canine’s in quite a few ways. Right before it hit its apex the cheeks started to part all the more. From between the middle a pink ring arose, as if it were a mountain peeking out just above some clouds. His tailhole was also similarly affected, growing so massive that it only amplified the overall girth from one cheek to another. The hole refused to slow down in its growth, becoming so overabundant it was nearly as tall as both of his cheeks at its zenith, and so wide and protruding it stood out at least half an arm’s length away from his taint. 
What nobody had expected, however, was for the newly expanded pucker on the ferret to yawn open slightly, right before gushing out a fair amount of opaque, white fluid. Despite the initial concern, the trio sniffed the air as it became filled with the aroma of fresh vanilla glaze, just as if the duo had finished baking a fresh several dozen batches of one of their top-selling donuts.

“Mmmmm, that smells fantastic. I thought you guys said you wrapped up this morning’s production early, though?” Psi was a bit perplexed by the aroma, but he certainly wasn’t going to knock it. He always grabbed two or three of those donuts on the way to work, anyway. “Or did I get so caught up that I couldn’t smell the other donuts?”

Vynx tried to stifle a laugh as best he could. “We wrapped up the early-morning run before you got here, but you know how fresh these things are. The new ones smell the absolute best, am I right, Arai?” Outside of Psi’s view the lynx was more than happy to pantomime what was going on from behind, especially with emphatic arm gestures.

“Y-yeah, love, absolutely right.” The husky couldn’t help but blush before excusing himself to take a look back there for himself. He had to be sure of the effects before the big reveal, after all. 

Pulsating almost imperceptibly, the immense donut Psi sported between his cheeks gushed out pure, vanilla icing as if he were filled to the brim with a massive pastry bag. The flow seemed endless as the ropes of viscous, sugary deliciousness seeped along part of his nearby cheeks, only to slide down those chunky legs until it all pooled along the linoleum floor.
To their credit, Psi’s entire rump was a bit over three times his usual size, each cheek around 14, maybe 15 inches wide. They definitely had to borrow some measuring take later, just to be safe. But that pink starfish on display was another matter entirely. From the hole to the rim it was as wide as the ferret’s still-thin torso, and from its jiggling both Vynx and Arai guessed that it was supple and quiet yielding as well. They looked at each other as they started to wonder how pliable it was, but that test went a little beyond the morning test run’s purview. 

 “So? What’s the verdict?” Psi inquired, trying to look back at his friends and yet only seeing his tail wagging heavily behind him. Even subconsciously the ferret’s body adored the alteration to no end.

Arai stood there for a second, staring at even the extra roll of fat just laying on top of that roly-poly ass, trapped between the hips and the top of that booty. “S-sorry! Just caught up for a second. I think Vynx and I both agree that we’ll have to get these into the storefront immediately, no changes needed. Wouldn’t you agree, sweetie?”

Vynx was still at a loss for words, but he nodded as enthusiastically as his neck could muster.

“When can I have a look back there, you guys? I’m really anxious to see what it did!”

Vynx coughed for a second before pulling out his phone, flipping quickly through the options before getting to the right app. “D-don’t worry! I don’t think a picture alone is going to do it justice, so let me nab a video of it first. Three minutes should be fine, right?”

“Make it four,” Arai chuckled. “There’s a lot of great detail I don’t think Psi wants to miss!”

“Alright, but I don’t know if I can wait that long. I may need to sit down before you’re done.”

The lynx and husky quickly looked at one another and tried not to explode in laughter. “I-it’d be best if you just kept standing until you can see the video, trust me. Then you can feel free to take a nap on my couch in the office! I’m sure you’ll find it accommodating!” 

What Arai really wanted to say was “massive enough,” but why ruin the surprise? 

The day was going to busy enough as it was, anyway. Vynx would have to step out and buy Psi a few clothes that would partially cover him up back there, but not until most of the department stores opened. The massive gains would likely be with Psi for at least two weeks, if Arai’s recipe and ratios were correct, but it could even last as long as the entire month.

As far as the icing was concerned, Psi would probably be on his own on that one. If the ferret still had enough strength at his own home after the bakery closed for the night, the duo already planned amongst themselves to stop on by and run a quick sample test of sorts. Of course, it was only to make sure that he was doing just fine.

Besides, they had to deliver the agreed-upon payment, anyway. One full box of this latest treat, another six purple beauties adorned with glaze, delivered right to Psi’s doorstep. 

Given his thrilled reaction to the video it would be, quite possibly, the best payment in the world.