A giant mountain, far away from civilization.  But this doesn't mean that there isn't someone living. The mountain, known as 'Rumbling Hills', was surrounded by a giant forest. Said forest was the home of a wolf pack, around 15 members belonging to it. 
It was a new morning for the pack, Boris, the leader of the pack, arranged a gathering like every morning. It was the middle of summer and a long heat wave made it very difficult to find enough water. There was just a single lake left and that's where everyone has to drink from. That's why the pack gathered every day; in order to walk together to the lake. It was, of course, the leader who was leading the pack to the lake. But this time was different; even after following the same route as always, there wasn't any water. Everyone was very confused; ‘Where has the water gone?’ was what everyone wondered. Boris was one of the first wolves to realize what happened. He climbed onto a rock and caught everyone’s attention. 
"Hey everyone! I can understand that you are confused and worried. It seems that the heat wave dried out even the tiniest bit of this lake too."
Everyone was starting to panic now. It was obvious; 'If there isn't water, we'll die'.
Boris had to do something, anything, and just in this moment he remembered something. "HEY!!" Everyone was looking to the leader again and waited for him to speak. "I know that you are all worried, but it doesn't help to panic.  I think I know of a solution..." The wolves started to look happier again, and he continued. "I once heard from a beautiful spring with clear water. The problem is that it is on the top of the mountain and--"
"What's the matter, there's a spring on the top? Then we'll just climb up the mountain."
Boris smiled a bit and nodded "Well then. I see that you are all ready to go.  Hehe, we shouldn't waste time… let’s start off soon."
Boris wasn't kidding; only a few minutes later, the pack began to make their way to the top. But the journey was much harder than expected. Normally it wouldn't be a problem for them but it was still very hot, which made them tired. The fact that they hadn't drank any was a disadvantage as well; and, on top of that, they hadn’t eaten, not even a bit. That was how they were; a tired, hungry and thirsty pack on a journey in the midsummer heat. However, the hope to find water gave them enough strength to make their way.
Two hours later, Boris was making the first step onto the top.  Everyone followed and looked around with big eyes. The top was a big plateau, but instead of grey rocks they found grass.  It was a giant field of grass, trees and flowers. Of course, the wolves didn't come to watch the flowers; everyone started to search for water. It didn't take much time until they found a little lake there. Needless to say, everyone was immediately drinking from the water. It took about five minutes until all the wolves had had enough to drink. Boris was looking through the pack and smiled. He decided that it would be a good idea to stay for a while. However he remembered that they have to eat something. 
"Rex!"
A black wolf was looking to Boris and came closer. Rex was a very loyal member of the pack and the right-hand of Boris. He was also very big, only Boris was a bit bigger. Rex stepped in front of the leader and smiled, and Boris spoke. "Rex, you and your companions will go back and hunt something for us. Do you think you can do it?"
Rex was just grinning "Nothing easier than that!" He started to run away and gather part of the pack. "C'mon, you heard him!" Three wolves followed Rex.  There was a white, a dark brown and a light brown one. 
15 minutes later Boris was sitting on a big rock.  He was looking through the pack and wanted to see if anything is alright. The wolf realized that it would be better to walk around for a while. When he stood up his belly started to growl a bit, it was starting to hurt a bit too. Boris was breathing deeply to calm down a bit and then started to walk. He was making just a few steps before his belly growled again. A few more steps and it growled a third time. Boris grunted and felt something very strange. The feeling was moving from his belly to his rump. A second later he felt a warmth escaping his ass, his eyes grew widely and he looked behind. There was a huge red flower that looked very beautiful. Boris could see how it turned into a very dark green even nearly black. A few petals were falling down before the flower withered and immediately died.
Boris stared in horror; he just killed a flower by ripping a fart. 'Leaders shouldn't walk around and stink up the air, especially not with farts.' was what he thought, holding back another fart.  Boris continued to walk around and did his best to look normal.  He was quite successful but actually he was almost bursting. He wasn't sure if he only felt like it; he was holding back a giant amount of gas, so much so that his belly was actually inflating a bit.
After finishing his round Boris felt even more bloated. Everything was ok so it was ok for him to search a lonely area. He was very happy when he found a place in the shadow. Boris felt how the gas was pushing and looked around, making sure that no one is around. He was sitting down and started to let the gas out in form of a toxic SBD. The grass under his butt was immediately dying; a few seconds later, the grass in the surrounding area withered too. Boris didn't expect such a powerful effect. He was walking away very fast, not wanting to risk that someone comes and sees him. He emptied out the half amount of gas but realized very fast that he was starting to produce it again... 
--
Rex and his friends were successful to climb down.  They just arrived at the forest and, like Boris, the four had a few problems with gas too, but since they were alone they didn't mind letting it out. However, farts weren't the only thing they had to let out. The four were drinking by far the most amount of water, and of course their bladders were really full because of this. They quickly found a perfect place to empty their bladders; Rex stood next to an anthill, and the others did the same. Circling it, the four cocked their legs at the same time. Rex grinned widely when he started to urinate in a thin stream.  The other 3 did the same and a few seconds later they were peeing with full force. The four golden fountains were destroying the hill completely, all the tunnels filled with very intense urine. After two minutes the wolves stopped and left nothing but a giant piss puddle.
Now happy about their empty bladders, the wolves started looking around for something to hunt. They wanted something that isn't too difficult to hunt but also something that is big enough for all the wolves of the pack. They were searching for quite a while but they couldn’t find anything.  It was very hard for them to hold back their farts now but that’s what they had to do; otherwise, they could scare away potential prey. So, they continued to search and eventually Rex found something; it was a very large deer, eating a few berries.
"Hey guys, this would make a perfect meal, wouldn't it?" Rex grinned. However, the other members weren’t as optimistic.
"You are kidding, this thing is way too huge. We'll never get it down…"
Rex was already expecting such an answer and chuckled "Well, normally that's true. But I think that we will be able to do it if we play a little dirty..." Rex had come up with a plan and told the others what they would have to do.
The four split up and walked silently. They positioned themselves in the bushes and smiled. The deer didn't realize anything and walked to a bush.  It lowered its head, wanting to eat a few berries. The deer wasn't expect something bad, so it didn't realize the black butt in front of him. Suddenly the deer was hearing a hissing sound. Not even a second later it felt something warm in his face before the toxic SBD finally hit the deer full force. The sulfuric stench made the deer's vision very blurry. It took a few steps backwards before it turned and tried to run away. The attempt ended when a dark brown ass suddenly appeared in front of its face. 
The wolf the ass belonged to was standing only on his front legs.  He was grinning widely and grunted before he ripped an awful fart, smelling like rotten meat. The deer made another attempt to flee, this time ending up in front of a light brown ass. A very squeaky sound and an awful eggy stench filled the deer's lungs. It was very weak now but tried to run anyways. The deer only took a few steps before it fell to the ground.
It was still conscious but very weak. Of course, the wolves wanted to change the first thing, so the white wolf came out and grinned to the victim. He turned around and sat down on the deer's nose.  The wolf grunted before a hissing sound was heard, an unbearable fart pumped into the lungs of the poor deer. It had an extremely acrid stench, like sniffing ammonia very deeply. Needless to say that the deer was going through hell. The wolf was able to expel the fart for a minute and a half, ignoring the fact that his victim had blacked out after 20 seconds. The others were coming too and looked down onto the deer.
It was Rex who got a bit too curious and took a small whiff of the face. Not even a second later he started to cough heavily. "Phew, you are hiding food from the others, aren’t you? Because THIS is now the result of our normal food."
The white wolf was clearly proud of his work and smiled, risking to take a sniff too. "C'mon it can't be as bad as you are trying to..." He immediately jumped away from the deer, his eyes tearing up. "Whoo, never mind!"
Rex and the white wolf motioned to the others. "C'mon you two, take a sniff as well."
The light brown wolf smiled and shook his head "We’ll pass…"
The white wolf walked to him and smiled. "I can understand it... the smell has to come to you." And, as promised, he ripped out a toxic fart, right into the face of his friend. He wasn't fully expecting it and breathed it in. The wolf tried to get rid of the feeling that his nose hairs are burning away. He was rubbing his snout through the dirt, inadvertently putting himself in an unfortunate situation. He could only see how the white furred ass sat down on his snout. A few deadly farts followed before the white wolf was standing up.  The other one was doing his best to stand but he was almost falling multiple times. Finally he was able to stand and the four were able to start bringing their prey to the others.
--
On the top Boris was still fighting with his gas.  The pressure was incredible high in his belly. He was going to search for a lonely place again to get rid of the gas but just in this moment Rex brought their prey to the pack. 
"Well, I think that should be more than enough for all." Rex smiled and got a smile from Boris in response. "What are you waiting for? You are the leader so you have the first bite." Rex pointed at the deer and grinned, while Boris slowly walked to it. The wolf was going to bite,  not taking care of his ass for a moment.
FRRRRRRRRRRRRRRRRRRT
Boris was very surprised and slowly realized what had just happened. He looked around and saw a bunch of wolves, staring at him with a shocked expression.
“I-I didn't want to..."
FRRRRT
Another fart made its way into the air, filling the surrounding area with the smell of spoiled meat. Boris was blushing brightly and panicked, just wanting to disappear. Things changed when the wolf heard a very strange tone that sounded like a tuba. Suddenly, he smelled a god-awful stench that out-stank his fart by far. His curious face moved towards Rex's direction. The black wolf was exhaling very loudly and chuckled. "Hehe, I think I should've warned you, my farts tend to be very smelly if I hold them back."
"Y-yeah, I see… uhm… smell…" Boris was still embarrassed but not as much as before. The feeling of embarrassment disappeared when Boris was surrounded by a bunch of loud farts and loud sighing. Boris started to chuckle before it slowly became a loud laugh.
Rex was laughing too. "Seems that you aren't the only one with gassy problems, hehe. I guess something was wrong with the water." The entire pack started to chuckle about it, ripping farts into the air. No one was holding back their farts anymore.
A few hours went on and Boris walked around again. He wasn't ashamed to let his loud farts flow; everyone was ripping at least one fart per 10 seconds. The beautiful flowers were all withered because of the farts, but no one cared. The wolves found the situation a bit funny and some of them were pranking a few others. Most of them were waking up their fellas with a juicy fart. Boris saw that more and more wolves got tired and realized that the night was almost coming. He searched for a good place to sleep and finally found a big cave. He told everyone to come in and that's what they did. Everyone laid down on the comfiest places and only 10 minutes later everyone had fallen asleep. Even with the wolves fast asleep, there wasn't a second without any farts being ripped and echoing through the cave.
--
The next morning came and Rex and Boris were already awake.  They looked around and saw that everyone else was sleeping.  They smiled to each other before they nodded and hiked a leg, looking behind them onto the others. 
"Three..."
"Two..."
"ONE!!!"
With that both wolves let loose a bombastic fart, waking up everyone else. The newly-awakened wolves sniffed the air and ran out of the cave. Both Rex and Boris sniffed the air and realized the ungodly stench that lingered in the air. "Seems that the farts were all trapped in here, and our 'waking up method' wasn't making it better."
They went out too and realized that no one was ripping farts. 
The pack was very happy but became very shocked when they saw Rex and Boris, drinking from the water again…