The sound of high heels carrying a running, sizeable person became louder. He gulped and tried to prepare himself. The door flew open and a woman with churning stomach sprinted inside. She pressed her butt checks together but still she ripped a bubbly fart every second or so. She quickly choose a stall and let go of her butt cheeks allowing her anus to continuously emit a foul, bubbling gas stream. Slamming her buttocks down on the seat she released a faecal bombshell into the toilet. Rotten, concentrated sewer sludge is probably the closest description of her faeces. He turned away as the smell overwhelmed him and the nasty sound she emitted terrified him. But she simply continued to expel her waste pulling her knees up to her chest and moaning as her colon continued to punish the toilet.

"Ah, oh, here comes yesterdays Chinese", she moaned almost orgasmic as a mushy explosion finally made the toilet overflow.


…


Oh, he hated his job.
He truly did.
The Sakawa moon base was owned by the Sakawa corporation. This location was chosen due to it's operations: developing potentially dangerous biotechnology so that in case of contamination there was no possibility of endangering the wider human population.

Many stern women worked at this place, growing fungi and splicing microbes in enormous test tubes designed to minimize the threat of leak. The cafeteria in which these scientists worked at ensured that their voluptuous, powerful bodies were kept so. Large, powerful thighs. Strong, hardened arms. And of course, their wide, heavy bottoms. A solid mixture of both muscle and fat kept the female workforce going.

He was just as important. He was the toilet cleaner assigned to female bathroom #4. And oh how he hated his job.

Around the clock, almost as an assembly line, women who had feed on the broccoli, baked beans, eggs and spicy meat ran with rumbling stomachs, gas exploding from their behinds, into female bathroom #4, hastily found a stall, removed their skirts and panties, slammed their buttocks onto the toilet seat and emptied their colon all over the poor, unsuspecting toilet. The majority of these toilet visits resulted in a clogged toilet, a good chunk overflowed the toilet, poop running downs the porcelain sides. The worst offenders also splattered their waste on the back wall too.

This meant that after each and every visit he had to jump to action plunging his entire arm's length down the drain of a toilet filled with rotten sludge to unclog it and hastily clean it up before another women came running in desperate need of relief. A job that would not have been possible without the Sakawa corporation itself as most humans who had to breath the heavily, methaned atmosphere of female bathroom #4 all day would have been made sick. But due to a biotechnological treatment he was able to spend his entire shift inside the bathroom even though it didn't make him tolerant to the smell itself.

But of course, cleaning up after all the toilet visitors didn't even mean much compared to: her

The chief scientist of Sakawa Biotechnological laboratory #7.

The worst part wasn't even that her active lifestyle meant that she ate more than everyone else at the moon base. Rather, it was the fact that she had biologically modified herself, making her bowels digest food in such a way that it smelled far worse than any normal human waste. And she loved to torture him, making her every visit to the toilet at female bathroom #4. Sometimes she came around a couple of times a day when nature called. Otherwise, when she was really sadistic, she held it in for as long as she could take, a little over a week at most, and therefore also had to hold her own nose as she shat to bear the stench.

It truly was impossible to describe just how nasty her waste was. He would rather clean up the poop of all other visitors to the toilet with his mouth if only it meant that he wouldn't have to deal with a single of her daily visits. And every time he noticed that she didn't come in for a day his anxiety would only increase each day until she finally, with her rumbling stomach and loose anus would storm into a stall and punish it.


….


"Oh you are gonna loooove this one aaaAAAA", she moaned as she ripped a nasty, wet sound and more diarrhoea crawled across the floor.

Her explosions were so powerful that the toilet was shacking, poop stained the entire stall and she could do nothing but moan as another bomb caused her endless relief.
Finally she was done. She stood up, wiped herself, and remarked, "the next time you see me you will experience something beyond anything", before ripping a last fart in his direction, pulling her panties and skirt up again and leaving.


….


He had not seen her for about three weeks now and he was as nervous as ever. When on shift he listened carefully each time he heard methane explosions in the distant closing in only to be both relieved and nervous to find it was just another desperate woman who had entered the bathroom to empty herself. What was she planning?

Then one day he found out that he had been replaced for his shift. Instead he was to meet up in the hangar and dress up in a moon suit. He hastily complied and was directed to a darkened pressure chamber. While in here he wondered for a while why he had not been given a helmet before a powerful force put him to the floor before he heard a *click* and the sound of the pressure chamber being emptied of air. While he still couldn't see anything he realized he had been put on a moon helmet and had an ominous feeling of who or what was present with him inside it.

Finally the pressure chamber door opened and he was dragged into the light on the surface of the moon. It was here he made the horrifying discovery.

"What do you think? I think I am going to have a great time", she said and smiled sadistically. Her stomach rumbled and churned.

He was like an animal at this point and with no means to escape he desperately clawed at the point where his moon suit attached to the butt helmet. But to no avail.

"I can tell you holding this one in have been something of a challenge but it doesn't really matter if there is a great payoff"

Her stomach churned louder and louder. He looked up and saw her anus, pulsing, straining as it battled to keep it's content locked away.

"You aren't going to like this one", positioning herself to have a clear view of her butt helmet.

Her anus suddenly stopped pulsing as it gaped open and with a nasty sound let out a putrid gas, poisoning the air in the helmet. Within seconds he realized that even worst shit she had ever taken was not even near being as nasty as the gas currently flooding the helmet. But it would not stop. For several minutes she continued to pump gas into his suit constantly breaking his belief in how bad something could smell. In the bathroom some of the methane would wander off and be ventilated away but in this helmet each and every breath was just as bad as the previous, except that for those minutes where she farted away, it only got worse and worse. All the while she moaned from the pleasure of finally giving up some of her bowel content. He on the other hand banged at the helmet, tried to take it off in an attempt to escape the stench, but his actions were for nought.
At last she let out a squeaky fart and stopped her bowel onslaught for a moment. She peeked at the helmet with it's content and the effect it had on him.

"I sure am glad I am not in there", almost a little fearful at the mere thought of being trapped inside the butt helmet. Her stomach rumbled.

"Hey big guy, now comes the really nasty stuff", she said and relaxed her anus.

He managed to open in mouth in a plead for mercy before rotten sludge painted the walls of the helmet brown, which to her disappointment blocked the view of his face.

"You are going to spend many fun hours in there", she said as she moaned away and continued to butt onslaught.