The siblings Lund and Sarah had a little game they played almost every day. A quick race across the ruins of a house they called home to determine who was faster. The game was rigged by design. The two ferrets couldn't have been more different. Lund was a very athletic male with a slender, feminine appearance. His body was made for running. Sarah on the other side was a chubby, well-endowed hermaphrodite who loved eating more than anything else. She wasn't completely untrained. After all, she went scouting and scavenging with him every day, but her voluptuous body made running difficult for her. Yet, it didn't stop her from being convinced that she would eventually beat him. They had pursued their competition for several years now. In the beginning, the price for winning had been minuscule. Usually one of them had to take over a task from the other, and since Sarah always lost, she had to do most of his housework for him. Over time, Lund intentionally raised the stakes. He wanted to know how far he could push his sister. The ferret demanded a kiss from her as a reward for winning if she wanted to keep him playing along. He mainly thought of it as a way to further humiliate her rather than reward himself though.

At that time, neither of them knew what consequences it would have. After a few losses, Sarah didn't think of the kiss as humiliation anymore and they both began to see it as a mutual reward. The fleeting, hasty smooch on her lips first became a longer, more affectionate kiss and later a lustful one with a lot of tongue. Subsequently, Lund felt compelled to raise the stakes again and demanded from her to let him fondle her if she lost again. It was around that point where both of them realized, after months of active denial, that they had something going for each other. From this point on, they also made out with each other outside the boundaries of the game. They had the little ruin they called their home all for themselves and there was no one around to judge them.

And yet, Sarah kept asking him to compete with her day after day. Lund's simple demands weren't enough anymore. He still wanted to see how far she was willing to go. The kisses and fondling were no punishment since both enjoyed it. And he definitely rejected any form of corporal punishment. If there was one thing he or Sarah would never do in their entire lives, it was hurting someone. Thus, he allowed his mind to drift into a more depraved, sexual direction. The next time they raced, he bluntly demanded a quickie as the winner's reward, and it didn't stop there. Yet, it still wasn't enough and somehow even encouraged her even more.

Lund indulged in even more debauched activities with her. On some days, he asked her to surrender her body to him for the entire remaining day. To grant him sex on demand, whenever he wanted and wherever he wanted. On other days, he ordered her to expose herself in public, to walk through the streets completely naked, or to flash passers-by. Initially, Lund was quite hesitant to lay a paw on her in public, but he grew more comfortable with it. He leashed her and took her on walks with him, fingered her in front of onlookers, fucked her in public, finally even shared her with friends. Only then he realized, that he was at least as much into all of this stuff he made his sister do as she was.  He loved the attention as much as Sarah, he felt the same rush of adrenaline and endorphins as her. However, it was a one-sided affair as he always assumed the dominant role. He was the one mounting her while others watched. It was never the other way round.

Obviously, doing such depraved things in broad daylight came with a considerable risk. Both of them had inherited impressive psionic powers and were trained well in using them. However, they were also small and easy targets that unabashedly ran around in the nude. Sure, their psionic powers were sufficient to keep them safe during assaults, but they also weren’t visible to the spectator. Thankfully, the little town in the wastelands had a watchful, diligent guard force that made sure that no one dared to assault them regardless of how tempting they looked. Unfortunately, their flamboyant behavior caused them a lot of trouble with the guard force. Sometimes when they were particularly provocative, one or two guards would come and detain them at the guard post. They’d serve a few hours and sometimes the entire night for causing trouble, then they were allowed to leave again.

The first time this happened was a pretty harrowing experience and they stopped running around exposed for about a month. The second time it happened, they took it much less seriously already, and on the fifth time, they used the time they spent in confinement to flirt with their guards. From this point on, detainment had lost all of its threat. Lund got to know most members of the guard force very well during those stays. Somehow, it made the two ferrets even more confident to display their rampant sexuality in public.
---
Life went along just fine up until now. Earlier this morning the unspeakable happened and due to a chain of unfortunate incidents, Lund lost the race. The most important factor was the two times he stumbled and fell which cost him valuable time in the race against his sister who was still dead-set on winning. His uncountable, easy victories had made him grow soft. The ferret didn't feel like he had to give everything to win and he had also neglected to keep a close eye on his sister's progress. Had he paid attention, he would've noticed that she had increased her daily training by a lot over the year. She was still chubbier and slower than him, but his accidents and his negligence finally granted her a very narrow win.

At first, Lund just didn't believe it, but Sarah made sure to make him very aware of the fact that he had lost to her for the first time ever. He refused to admit his loss until he watched her put the black collar around his neck that usually always stayed around hers. Large silver letters spelled the word ”SLUT”, a trinket he had found in the rubble a few years ago. His sister looked at him and gave him the most genuine, devious grin he had ever seen on her. This was the point where he gave in. She had defeated him fair and square, his loss was only his own fault. Lund wasn't a bad loser, though, and he acknowledged that she deserved a reward for her persistence. Also, to be perfectly honest, the depraved part of the ferret's mind was eager to see what she had in mind for him now that he had lost.

Sarah tied a leash to her brother's new collar and made him follow. Their first destination was the little kitchen. What must've served as a storage room before the war was now equipped with a stove, a fridge, and a microwave. ”Would you like to have a second breakfast with me, Lund?” his ferret sister asked him. 

”I mean...” he stammered. He had already eaten before sunrise and, unlike his voracious sister, he usually never had another breakfast after running. 

”That's the wrong answer, Lund. But because I like you, I'll give you another try,” she interrupted him with a smirk. 

”Of course I want another breakfast, Sarah,” he replied meekly. Lund was a little surprised when she suddenly began undressing in front of him. ”What are you doing?” 

”Getting more comfortable.” 

”Now? Here? Didn't you just want me to eat another breakfast?” 

”Yes, just wait for it. I'm going to show you something new here. I need you to strip down, too.” There was an authoritative aspect in her voice that made him swallow any further remarks, and he did just as he was told.

Fully undressed he stood there, feeling his sister's lustful gaze on his body. Lund felt a little embarrassed. It was the first time she looked at him like that. Usually, it was the other way round. There was nothing loving or endearing about her gaze, no, she stared at him with undisguised desire. She treated him exactly like he always did after she had lost yet another race.

”I'm really blessed to have such a beautiful little sister,” she sneered and watched his befuddled reaction. 

”Little sister?” he whispered silently. 

”Oh, I've waited so long for this very moment. You've gotten negligent, sis. Now it is my time to claim your pretty body and treat it the same way you've treated mine so many times before,” she gloated. Lund was still confused about her calling him sister. Sure, his appearance didn't look very masculine, but that was normal for his species. It was rather difficult to look masculine with a long, lean body that had no large chest or broad shoulders. And maybe, just maybe, her mockery was also aimed at his relatively sizable hips. His face didn't look masculine either, but what could he do? It was just another thing common with his species. At least he still looked androgynous and not feminine, right? The same applied to his high-pitched voice. 

”Sis? Why do you call me that?” he asked warily. 

Sarah laughed, ”Oh, come on. Just look at you! Without knowing any better, everybody would call you a girl. And it's not only about your appearance but also about your demeanor, how you behave, how you walk. And there is yet another argument I can make, my cute little ferret gill.” 

Sarah moved closer and grabbed his shoulder. She then grabbed her dick and pressed it against his shaft. Both of them looked similar. They were both covered with smooth, white skin all the way from the shaft to well over the tip. The only notable difference was their size, hers was significantly larger. He trembled as he felt her massive cock throb against his puny manhood. For some reason, he had never done this kind of comparison ever before. Oh, who was he kidding, he knew exactly why he had never done it before. Sarah was almost twice his length and her shaft was much girthier and plumper, so much bigger. Lund always felt a little sting of envy whenever he thought about it, so he generally avoided thinking about it at all. At the moment this was obviously impossible since she practically forced him to witness and acknowledge her superior endowment. Gently and sultry, she whispered into his ear, ”Don't worry, love. I always wanted to do this just for the sake of it, I just wanted to feel how it's like. In the end, it doesn't matter, how big you are, it only matters how much fun you can have with it. Now, I want you to take a second to remember something. Don't you remember the many cases we've been called sisters, where you've been called ma'am or missy? Didn't you see the surprise on their faces when they discovered that you were actually a male?” Her voice was soft, but the impact of her words on Lund was enormous. On all the other days, he just didn't have time to waste even a single thought on this. Repressed but not forgotten, her tender words awakened memories he had left to rot in the farthest corner of his brain. Everything she said was correct. His reply consisted of nothing but a single word: ”Yes.” Sarah grinned jovially, she truly wanted to make the most of her victory.

Next, his sister gathered a lot of food and put a varied, rich selection on the table. She then took a seat on one of the chairs and demonstratively spread her legs. Wearing no clothing, there was nothing to conceal the huge cock that was throbbing and swelling between her thighs. ”Come here, have a seat. I want to feed you,” she told him.

Lund hesitantly stepped closer and pointed at her erection. ”Like, right on your lap?” 

”Where else would you take a seat, hun?” Sarah replied with a sly smile while she kicked over the other chair at the table. She grabbed her shaft and held it up, ”I want you to sit right here. You can give it a lick first if you're not comfortable taking it, sis. Also, maybe you should give the table another look?” The ferret turned around and almost immediately spotted a bottle of lube among the food. How considerate of her, he thought, but he was actually grateful that she had thought of it. Admittedly, he felt a little weird as he uncapped the bottle and prepared himself in front of his sister. The whole time she gave him this greedy look all while licking her lips and idly playing with her cock. Compared to her voluptuous body, he was as skinny as a needle. Everything on her was full and luscious, her ass, her hips, her legs, her arms, her belly, and even her tail. Underneath her large cock rested a full, plump pair of balls. They were covered in the same short, silky, white fur that covered both their bodies. She also had eight teats, but only one pair had developed into a pair of voluptuous breasts while the others were almost perfectly flat.

Once he was done she gave him a sign and rocked her hips in excited anticipation. He turned around and carefully took a seat on her lap, making sure to guide her swollen member with a tender grip. Gasping, he felt the head pop in. Lund held his breath while he slowly sank down on it, allowing her large shaft to fill and stretch him wide. It didn't take much of it to make him feel full and stuffed. It was a wonderful feeling which, coupled with the satisfying pressure against his prostate, made him coo with delight. He didn't take her very often. Usually, his sister was on the receiving end. Lund loved the feeling and he wondered why he didn't take her more often. Just enjoying himself he completely forgot what he was doing and stopped. Suddenly, he felt two paws forcefully push him down. Sarah's cock was only halfway inside him and she was very eager to get in all the way. She even raised her hips to assist her advance and drive her entire length into his warm orifice. The ferret yowled and groaned, his sister's cock was large enough to form a visible bulge on his flat, trained belly. ”How do you feel now, Lund?” she purred into his ear. 

He nodded and moaned, ”Wonderful, love.” 

”That's what I like to hear.”

This whole time the food had been on the table. Sarah finally made use of it. She grabbed a handful of berries and started feeding him, piece by piece. Initially, she just held them in front of his muzzle and waited for him to pick them out of her paws with his mouth. After he had eaten a few already, she got more involved and actively pushed the berries into his mouth. Eventually, she went even further and placed them onto his tongue, pushed them deep into his muzzle. After she ran out of berries, she fed him other fruit, bread, and pastry. She cut the bread into pieces, pressed the soft inside of each piece against his erect cock, and squeezed a bit of his pre on it. She made him worship every single fruit she gave him. He had to lick the fruit sensually before he was allowed to take a bite. Intrigued, Lund played along and did as he was told. Right now, this kind of food play felt more weird than enjoyable to him. Sarah, on the other hand, loved it. He could sense it by the way her cock throbbed and pulsed inside him, how she got all aroused and excited over this simple process. Feeding him, watching him eat, it gave her pleasure he didn't really understand.

It still felt good, mainly because of the fact that he was sitting on her large cock while she did all of this. Resting deep inside his ass, he felt her every motion. Every time she touched his painfully erect shaft, be it with her paw or even with another piece of pastry, he rejoiced.

Pleasure built up naturally over time even though neither of them was actively working for it. It just happened while she fed him. On that note, Sarah wasn't even close to stopping feeding him and she kept stuffing him with merciless determination and even more food. 

”What are you doing? Are you trying to fatten me so I'll lose again?” Lund joked between two bites. 

She chuckled and whispered softly, ”Yes, maybe that's what I'll do. Stuff you until you can't walk anymore. No, do you know what's the real reason I'm doing this?” 

”Tell me.” 

”Look at your nice little body. You're so thin that even a little change becomes visible in your shape. Honestly, I'd love to stuff you every day until you're even bigger than me, but I know that you'd never accept this. Instead, I'll just watch your flat tummy inflate into a big ball from all the stuffing. It certainly will be gone by tomorrow, but I'll make sure to enjoy it while it lasts.” 

”You're weird, sis,” the male ferret replied. 

Sarah giggled and shoved another bit of pastry into his mouth, ”I know. But you aren't much better, little sis.” Then she began jerking him off with a random soft bun. Lund was too close to think about it too much or raise objections, so he allowed her to keep going until the very end. His entire body started trembling while he came into the bun's inside. Sarah just kept stroking him further and smeared his cum over everything. It felt wet and warm, which caused another set of spurts from him. She held it there, pressed against his cock for a moment, and quipped, ”It looks almost like a hot dog, don't you agree?” 

”Oh, come on, sis!”

Now thoroughly soaked with his juices, she held the bun in front of his face. Lund knew immediately that she wanted him to eat it whether he liked it or not. He took the initiative and gave the bun a careful lick. Unsurprisingly, it had the taste of his own seed mixed with the fresh taste of bread. Then she took over the lead again and he felt her push the bun against his lips, shove it into his muzzle and briefly make him gag on it. His own taste filled his entire mouth and it got even stronger once he chewed on the bun. Lund didn't hate the taste of his own cum, but he rarely got the opportunity to taste it. So he had no issue swallowing everything after chewing it quickly into mush. While he swallowed the bits of soggy bread, his sister rose from the chair. She firmly grabbed his hips and began to thrust her cock into him with lustful fervor. The sudden change of pace surprised the ferret, but it didn't last very long. Sarah came after a short and wild romp. She sighed lewdly and shoved her entire huge cock into Lund's ass. The male felt her flood his intestines with her warm cum. As with everything else, her load was much bigger and more voluminous than his. Her potent baby batter quickly filled him up and bloated his belly into a bulge. Sarah sat back down with him and he heard her wet creampie slosh inside his guts. ”Fuck, I love your tight, cute ass, little sis,” she moaned while rubbing his belly. 

”And I love your cock, sis,” Lund replied, hopefully adding, ”Are we done now?” 

Sarah gave him a cockish smile and shook her head, ”There's still empty space inside you. And I want to stuff you until there's no space left.” She picked up a peach, pressed it firmly against his lips, and forced him to eat it.

A few minutes and many bites later, the ferret had finally reached his limits. Every further bite was an arduous exertion and he was sweating from the sheer weight and pressure of the food inside him. Luckily, Sarah recognized that he couldn’t take much more and she stopped. If she kept going, she just risked him vomiting all over the place. ”You’ve done a great job, honey,” she praised him. He was too weak and exhausted to get up, so he was damned to sit in her lap and watch while she ate the remaining food. The whole time she casually rubbed his bulging tummy with a paw. Lund was thankful for it because the gentle, rhythmic movement helped his body cope with the overfeeding. His flat body had two now two readily apparent distentions. There was the long one where his sister’s cock was stewing inside him, and a rounded one where his overstuffed stomach bulged out from below his rib cage.

Once she had devoured the remaining food, she got up and went to town on him a second time, pumping a fresh batch of cream into him. Then, she finally pulled out of him. Lund almost failed to notice it, he was feeling too full to really notice anything else. Without her holding him on her lap, he just dropped down onto the floor and lay there apathetic and wasted. Sarah had one last thing in store for him. ”I've given you some time to digest your meal. I think now is the right opportunity for some dessert,” she snickered and squatted next to his head. Her large cock had softened, but it was still considerably engorged. It glistened and dripped with her and his intermingled juices. 

Lund gave her a faint smile and replied, ”Oh, yes. Gladly.” He opened his mouth and allowed her to push her swollen dick past his lips and deep into his gullet. The ferret wasn't sure whether this was the best idea as he still was a little nauseous, but it was less bad than anticipated. Somehow, he even welcomed the musky, salty and strong flavor of her cock, her cum, and his own ass. It was a great distraction from the sweet, sugary taste of all the sweets and fruits she had fed him. Lund gladly sucked and licked the wet mess from her cock, allowed her to thrust it down his throat all the way. He held his breath while she did this and excitedly traced the swollen bulge her shaft formed on his neck with his fingers. 

Sarah pulled out in time and allowed him to suckle a little on her tip before getting up again. ”You're a fun plaything. But I'll give you some time for yourself now, honey. Wouldn't want to break you.” She gave him a kiss on his forehead and left the kitchen.

She let him lie on the kitchen floor for thirty minutes. The male spent most of the time motionlessly staring at the wall opposite of him, heavily breathing and gasping for air. Thoughts popped into his mind and vanished, he just didn’t care right now and only waited for his body to cope with all the food. Luckily, it eventually got better and he was able to breathe normally again. Lund sluggishly rolled onto his side and struggled to get on his knees. He then grabbed the table’s leg and pulled himself up. She had made him eat more in one sitting than he would’ve eaten in two days otherwise, he thought while massaging his bulging stomach.

A noise behind him made him turn around. His sister had come back. ”Hey, Sarah,” he said warily. 

With a big smile, she told him, ”You’re back on your feet again. Great! Let’s have a walk through the streets, shall we?” 

”Ugh, I don’t know. My legs feel like pudding and I can barely even walk.” 

”Don’t worry, love. There is no hurry and I’ll support you if necessary. Now, come. I need to show everyone that I’ve won.”

Lund grimaced, but he complied and slowly followed her. Step after step, still shaky and always struggling to keep himself upright. He had paraded her around the town uncountable times, now it was her turn to do the same with him. His sister turned around before she stepped through the door and patiently waited for him to catch up. Once he was in her reach, she grabbed him and pulled him against her chest. ”I love you, my white little star,” she whispered. Then she gave him a long, lewd kiss. Lund smiled, it still felt weird but he began to enjoy how she treated him.