Flarington, 11pm. 
Blake and his best friend Archie just arrived in their hotel room, exhausted from a long day full of training. 
Flarington was well known for organizing one of the biggest battle contest in the world and Blake wasn't going to miss his chance to participate this year. Of course the fox couldn't fight there himself, his by far strongest Pokémon, the Arcanine Archie, was going to do this job. 

They were best buddies for a very long time. Blake took care of him when the Pokemon was still in an egg. 
After his birth, Archie came out to be full of energy, really enjoying it to battle. The fox decided to further that interest and eventually went on a journey with him. Archie came to be way huger and especially stronger than others of his kind, making him very good in battling. 
Of course Blake had other Pokemon too but Archie was by far the one he used the most. 

After winning a lot of competitions, Flarington's was going to be their greatest victory. 
Flarington was actually that proud of it's contest, that it was full of training places. All the trainers that stay in the city could use them for free. 
The two used this to train all the day, from 5am until now. 

Blake put off his shoes and threw them in a corner before he let himself fall onto the bed. 
Just when he was happy to get some relaxation, Archie nudged him with his nose. Blake got into a sitting position and looked at him, smiling. 
"What's the matter, boy? "
The Arcanine whimpered in response, ears flat against his head. Blake also saw that he was fidgeting a bit, realizing what it is. 
They were so focused on their training that Archie didn't realized how full his bladder was and Blake simply forgot about the possibility. 
The problem at this point was that peeing in public is punished very hard. The chance to get caught was almost 100% since there are cameras everywhere. 
The next park, thus an area Pokemon are allowed to take a leak in, was 30 minutes away. Way too long for the canine, who's bladder was almost bursting. It would come to an accident and thus a punishment. 
Blake gave his friend a pat. "I know you hate that but you will have to go to the bathroom... "

Archie indeed hated it to use the toilet. He didn't have to use one since he evolved. He didn't like it to get into different positions before he could finally aim properly,and now he was way huger too. 
The Pokemon tried to make some puppy eyes and whimpered more. Blake thought of a solution and found it pretty fast. 
"Well, since it's an emergency, I'd say you just pee on the floor. It's made of tiles, nothing you could really stain. It'll flow to the drain and I use the shower to wash the rest away. And tomorrow the service will clean it anyways. 
Does it sound better? "
Archie noded before he lets out a happy bark. 

The canine enters and lowers his lower body. Blake expected a flood of urine to be splashed on the floor, instead it barely came a drop. 
Archie didn't feel all that comfortable with the idea to pee onto the floor. Though his  bladder nearly explode, a mental blockage prevented him from actually peeing. 
Blake came closer and pat his head. It actually calmed the canine down and a bit of urine shot out of his sheath but as fast as it started as fastly it stopped again. 
Blake realized that he had to calm him down. 
The fox got on his knees and pushed the pokemons lower body up again before he started to rub his belly. 
He pushed a bit against his bladder and actually succeeded to push out more urine. Unfortunately it wasn't very much again. 
He saw that it didn't work that much and came up with another idea. 
Blake laid down under the canine and reached out for the Pokemon's sheath. 
Archie tensed up a bit, surprised to get touched there but quickly calmed down. Blake began to stroke it, blushing a bit while doing so. 
Archie blushed too but he was getting relaxed. He closed his eyes and finally managed to pee. 
Blake had a little disadvantage in his position, as the stream was directly aimed at him. He quickly got to the side, dodging the stream that now splashed all over the floor. 
It took him almost 2 minutes to let out all the 3 liters of urine, sighing loudly in relaxation. 

"Bet it felt really good, eh? "
The canine began to lick over his face, trying to wash away the urine, Blake patting him in response. 
"Don't worry about it, big boy. I'll just take a shower and then it's all done "
He smiled when the dog left the room and locked the door. 

Archie waited about 20 minutes before the fox left the bathroom.  Blake yawned and Archie did it too after seeing it. 
"What do you mean, call it a day? "
The canine barked, it was his way of saying "yes".
Blake laid down onto the bed, pulling the blanket up all the way to his chin. Archie climbed onto the bed too, curling up like a normal dog. 
It didn't took them more than five minutes to fall asleep, looking very peaceful.

A few hours passed. Two, maybe three. 
Blake had a very deep sleep, it was the case for Archie too but he wasn't nearly as relaxed as Blake. He was moving around in the bed for a little while, waking up the fox. 
"C'mon, Archie... " he began to poke the Pokemon, who currently laid on his back, into his belly, trying to wake him up. It didn't work but fortunately his movement became less before he was quite again. 
Half an hour later Blake already slept again. Archie also stayed quiet until now. He started to shift around again but the moment Blake woke up again, his movement stopped already. Unfortunately it was the main problem this time. 
Archie laid flat on his belly, pinning the fox under his weight, including his arms. This wouldn't be a problem at all but unfortunately Blake was facing the arcanine's rump, his head trapped between the dog's thighs. 
He tried to free his arms but Archie was to heavy. Without any alternative he tries to speak to him. 
"Hey, Archie... could you please move? "
All he got as an answer was a strange gurgling sound.Blake raised an eyebrow when Archie's tail suddenly went up. The fox became very nervous when he heard a hissing sound, followed by a warm feeling. 
He didn't realize what just happened until he breathed in. The putrid stench of a rotting corpse started to fill his nose. 
Blake wasn't going to recover very soon when Archie bombarded him with another, yet squeaky fart. It didn't last very long but it sure was potent. 
The fox felt like his nose hairs were burning away due to the pungent gas, struggling desperately to free himself. 
He began to yell for help, immediately regretting it when Archie moved back. He was actually pressing his ass into the fox' mouth. 
Blake shouted even louder but without any use. His voice was completely muffled by the fleshy rump. 
His ears perked up when Archie's belly made more strange noises, indicating the imminent threat. 
Only passed before the canine ripped a massive fart. The entire gas went into the fox' mouth that was still forced to stay open by the heavy rump. 
The sulfuric gas may smell extremely bad but it's taste was simply unbearable. The fox shouted with all his strength, struggling hard to free himself. Both, his muffled shouts and his fighting were fruitless, Archie was simply too heavy. 
And so he was at the mercy of Archie's ass. Unfortunately his gas tank was everything but empty and so the fox' lungs were slowly pumped up with farts. 
Blakes mouth, aswell as his throat, became completely dry. 
Archie ripped a last, almost seismic fart before he moved forward again. Blake was able to breath relatively clean air again, unfortunately it was of no use for him. The last fart knocked him out completely. 

It was already 8 in the morning when the fox slowly gained his consciousness back, if only barely. 
His head was soaked in sweat due to the surrounding air's high temperature 
He took a whiff of the it, immediately retching. Archie kept ripping short SBDs the entire night, ripping them even yet now and then. 
Archie still pinned the fox under his weight, leaving him a bit longer at his farts' mercy. 
The dog slowly woke up and got into a sitting position. He didn't realize that he was sitting on his trainers face, thus he didn't saw a reason to stop his intentions. He closed his eyes, clenching his teeth and pushed. 
Blake yelped loudly when, yet again, his lungs were filled with extremely potent gas. 
The fart didn't last for longer than 3 seconds but it was already enough to make the fox scream. Archie was unable to hear the muffled scream, especially since he was still half asleep. And so the true horror was only now to come. 
Archie pushed yet again, unleashing a low pitched monster of a fart. The dog leaned forward when he kept the fart flowing. After 15 seconds the sound became quiter and more high pitched, after 20 seconds it was nothing more but a hiss. Eventually the fart stopped after 26 seconds. 
He sighed in relaxation, his tongue hanging out. It wasn't the first time he unleashed these kind of bombs in the morning. Blake would normally complain about it, be it seriously or in a kidding way. 
Archie was completely awake now, realizing that the fox didn't react to it. 
He looked around and eventually saw where he sat. He immediately jumped off the bed and looked at the unconscious fox. 
He bumped his snout against his face. The Pokemon got a got a good whiff of his farts, immediately backing away. He whined a bit, pushing the fox with his paw. 
Archie waited a bit, licking and nudging him from time to time. 

Eventually the fox woke up again, feeling a bit dizzy. He gave Archie, who looked at him with a worried expression, a few pats. 
"I dunno what you ate but remind me NOT to feed it to you ever again, especially when we are sleeping in the same room! "
The fox laughed before getting a very long shower. 
Archie released the rest of his gas against the pillow, Blake wouldn't realize it before the end of the day. He would think it was coming from this night anyways.