The slave was tied up, with chains, on a bed. Under the ass of his gassy mistress, he was being bombarded with horribly stinky farts: the mistress had a special diet which made her farts even stinkier than her usual farts (which are very stinky already).
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The slave groaned in disgust as his mistress farted on his nose, it was a really stinky fart, he was not ready for sniffing such a putrid gas. Breathing near her anus felt humid, hot and stinky, even when she was not farting. Also, the smell of her farts tends to linger for a long time after she farted, reducing the time spent breathing relatively odorless air.
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The slave coughed, the smell was unbearable, he wondered why her farts were so... no, scratch that, he had no thoughts, just a nasty stench blown into his nostrils. The gas was hot, and stinky, and it felt like having his face in front a stinky hair-drier that blows hot air that smells like rotten eggs and spoiled milk, right on his nose, and he couldn't get away or pull his face away, no matter how stinky her farts were. The mistress laughed, she enjoyed tormenting her slave with her stinky farts.
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The slave couldn't do anything but to inhale his mistress' divine gas. It was stinky, but he had to love everything about her, even her farts. He was being trained well, but despite how many times he had to sniff her gas, he still wasn't used to the smell, he was coughing and if he kept sniffing her gas he'll start gagging soon, because her farts are unbearably stinky.
He tried to pull his face away but he was tied up so he couldn't do anything, he could just cough, groan and soon gag, he was at his limit, the smell was too much for him.
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The slave was now gagging, the amount of rotten stench that was entering his nostrils deep into his lungs was disgusting, it was a sulfuric eggy stench that was difficulting to breathe in, because it was very stinky. But he knew he had to sniff it, because they were the farts of a very important woman. He tried his best to take the gas in, but it was so smelly that he started gagging. That was his place, and he had to sniff her stinky fumes. The smell was nauseating and putrid, but he was ready to sniff more.
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The mistress was very gassy, she's usually always very gassy but today, her new diet was really working, her farts were even stinkier than usual. Even at their standard level of stench, however, the slave was unable to tolerate the putrid stench. But today, he was struggling even more. He wished he could breathe some fresh air that didn't reek of her farts, but it was not his job to wish for such a thing, his job was to sniff her farts.
The mistress wasn't doing anything while face-farting her slave, except for emptily staring at the wall, with no thoughts on her mind other than a smug feeling of superiority and satisfaction that he had no choice but to smell her stinky farts.
Her farts smelled rancid, like an egg salad that you forgot a month ago inside a malfunctioning fridge, the slave would had liked to breathe some fresh air, it would had been better than feeling like his nose was burning and his nostrils' hair decaying, but it was not up to him to decide, the mistress was gassy, and a slave that can't breathe the flatulent fumes in (so that the mistress doesn't have to smell them) is a useless entity, as useless as drinking a bottle of imaginary water, but since the slave could be (and was) used as a "human" (debatable) fart sniffer vacuum, then he was slightly more useful than that. All he could smell was her farts, they were not mild farts, they were really stinky, he couldn't help but gag even after taking small whiffs of that putrid gas.
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The slave was gagging because of the putrid stench of her farts, but sniffing her farts was his only purpose in life, that's what he had to do, and he had to accept it. Both him and he mistress knew it, it was unnecessary to ponder such an obvious fact.
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Soon, the mistress decided to punish her slave. Punish for what, what evil has the slave done, is unclear, only the mistress knew the reason. Her mind was like a black box, on her face was an unreadable expression, her quiet temperament making it even more difficult to guess what she was thinking. In many ways, she was like a closed-source proprietary operating system. The punishment that she'll give to her slave is: a stinky dutch oven.
She got up for a moment, the slave could breathe a momentary sigh of relative relief. The stinky gas was still lingering around his face and his nose, though, so it was not a total relief. And it shouldn't had been. The mistress covered the slave with a blanket, and she trapped him under it. She was starting to feel sleepy, so she decided to take a nap, and of course the slave was trapped under the blanket with his nose trapped between her asscheeks, his nose was closely touching her butthole, every burst of gas travelled up to his nostrils with no time for the stench to be diluted across space.
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The mistress farted on her slave's nose, the rotten smell was starting to fill the air under the blanket, and the slave had to smell it. In such a closed space, the smell was becoming really strong, the slave couldn't help but gag. The mistress was a bit sleepy, she closed her eyes so that she could sleep for some time. She deserves a comfy rest, unlike the slave, which still deserves to rest (just like a portable electronic device needs to be recharged in order to properly function), but not without sniffing some of the mistress' stinky farts.
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It was such a relief for her to release so many farts, 'better out than in', her belly was bloated like an operating system full of shareware and other unwanted pre-installed software that cannot be uninstalled without "rooting", full of background processes that stare into your soul like a crow bringer of bad omen. Her way of debloating was farting over and over again, the air under the blanket was filled with a pervasive, thick, unescapable stench of rotten eggs, broccoli and spoiled milk, a pungent, sulfuruous stench that made the slave gasp for air, but the only air he could breathe was her stinky farts. The slave had a strong desire for fresh air that didn't reek of rotten farts, but his desires were irrelevant, the mistress wanted him to sniff her farts, and that will be what happens. The mistress thought that the slave should thank her for giving him her precious gas as gift, but all he did was gagging and groaning, the stench was difficult to inhale, it burned his nose and lungs and made him want to throw up.
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Each time she farted, the air under the blanket became even stinkier than it was before, the putrid fumes under the blanket at that point became absolutely devastating for one's nose, the smell alone made the slave's eyes water almost as if her farts were made of tear gas, except that his eyes were watering just because of the stench, unlike substances found in onions like syn-propanethial-S-oxide which make your eyes water for reasons unrelated to smell.
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After taking a nap for some time, the mistress woke up, with a strong desire to keep the slave under the blankets for as long as possible, she wanted him to truly bask in the stench of her farts and inhale her fumes as much as possible. She farts a lot in her sleep, but she also farts a lot when she's awake, and her new diet was working wonders when it came to making her farts truly nauseating and putrid, a stench so vile that if one had the option to avoid it, one would avoid it. But of course, the slave had no such option.
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As the stench under the blanket was becoming more putrid and revolting, the slave was gagging harder than before, he sounded like he was going to throw up sooner or later, the mistress just sighed and smiled, she absolutely loved the reaction of the slave, and she decided to keep farting even more to see how intense the reactions of the slave would eventually become, once the stench will saturate every nanometer of the air inside the blanket, a stench so thick that it almost felt like it could be cut with a knife just like the cheese the mistress was cutting, idiomatically speaking.
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The gagging of the slave sounded 'liquid' in a sense, he sounded like he was going to throw up sooner or later, as if the vomit was already rising up his stomach, and the mistress laughed a lot because of that. After some time, however, she decided to lift the blanket from his face, but she will keep farting on his face for quite a while. She got up for some time, then she lifted the blanked from his face, and she decided to just face-fart him. As she lifted the blanket, an absolutely putrid stench of decayed yolks spread across the room: there was quite a lot of flatulent gas that was trapped under the blanket, and now the stench filled the entire room, even the mistress was coughing from the smell of her own farts. She decided to open the windows and breathe the fresh air with her head stuck outside of the window for some time, then she came back and she sat on the slave's face to face-fart him again. She loved it when he sniffed her farts, especially when her farts were really stinky and he had no choice but to smell them.
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The mistress giggled, her stinky farts were all that the slave could smell. No 'odorless air', the slave should thank the mistress that he has such a privilege of being able to smell her farts, he shouldn't be ungrateful! The mistress is planning to punish him again if he keeps being so ungrateful to her.
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As the slave groaned from the horrible stench, the mistress laughed, and she uttered the first and last words she has uttered and will utter for a long while: Sniff
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It seemed like there was no end to the face-farting, it was a horrible stench, sure, but it was a stench that he had to get used to eventually, because that's a smell he's going to sniff a lot, it's nasty and nauseating, but it's his privilege, and he needs to understand it.