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Ricky screemed yet again when the ass in front of him let out the 213th fart so far. The young wolf was already regretting the prank he had planned for Santa. 
Rubbing some grass through a substance that causes excessive gas and feeding it to Santa's reindeer sounded like a good plan to him. But it backfired very badly when the reindeer refused to eat it, Ricky trying so hard that he didn't realize when Santa came back. But instead of shouting at him, the fat panther (as Santa looked like in the furry world) had a different idea. 
The wolf's head was fixed to Rudolph's rump with a ribbon, just after he was fed some of that grass by Santa. The results for the wolf were quite
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...smelly. 
"My, that sounds quite unpleasant. Hang in there, my friend, just 20 houses before you are freed... " the panther said in his deep, friendly voice. 
Ricky's ears perked up when he heard that. He feared that he was going to spend all night trapped there but if it was just 20 more houses to-
"...and bound to Dasher's butt. " the feline added, shattering the Wolf's hopes at once. 
"It's going to be a fun time! And don't worry, I'll let you out where I picked you up "
Rudolph let out another huge fart before they prepared to land on the next rooftop. 
Ricky already knew that he wasn't going to get any breaks. Not having to concentrate on flying the red nosed reindeer could focus completely on-
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Like the ten times before, Ricky suffered a constant stream of horrible gases while the Santa brought the presents into the house. Fortunately, at least if there is something "fortunate" about so many farts to the face, the panther didn't need a full minute for each house, keeping the time of uncontrolled farting at a minimum. 
Ricky could hear him take a deep sniff next to him before feeling a pat on his head. 
"Ho Ho, at this rate your nose is going to shine even brighter than Rudolph's! " he said before entering his sleigh "Just 19 more! "
The reindeer let out another deafening fart before they began to fly again. 
And that's how basically the next 18 houses worked. Rudolph would fart occasionally during the flights and without any breaks when Santa brought the presents. 
Only the last time worked a bit different. 
Ricky had expected to be untied after the presents were brought but Santa had another plan in mind. The wolf didn't even have a chance to pull back his head before Rudolph sat down, resting all his weight on his face. 
"This house is going to take a little longer. Rabbits, and that means many presents " the panther chuckled before leaving. 
Just the right moment for Rudolph to let out a very massive fart. This one, as all others before, reeked solely of rotten eggs. Only this time the entire gas was blown into the wolf's nose, the reindeer's weight causing his snout to go up his tail hole and to function as a cork. 
Ricky could tell by the increased volume of the farts that the substance's effect began to end. 
This too, if this could be said in his situation, was a lucky thing for the wolf. He never held a grudge against Santa and didn't plan to make him suffer from the farts. He only intended to do a Prank by turning the reindeer into farting machines for a short time. 
But he knew that the farts were way worse than expected, now that he had to sniff them by himself. 
Just before Santa came back, Rudolph let out an very long and extremely wet fart, the stench being tenfold bad than before. It was a horror that lasted about 20 seconds before Rudolph got up, Santa having to pull the wolf's snout out. 

"Now, do you want to feed Dasher? " the panther asked with a smile. Ricky couldn't help it but nodded, probably due to the nice way he was still speaking in? It was something that the wolf realized quickly, that Santa never sounded angry and never had an evil tone. Even now his smile was a warm one, not an evil one. 
The panther gave him some of the grass and the wolf held it in front of Dasher who ate it with joy. 
Santa was quick to tie Ricky's head to the rump before flying to the next house. Unlike Rudolph, Dasher needed some time for the grass to kick in, catching the wolf completely off guard when he let out a silent fart that reeked of spoiled milk, followed by a very loud one. 
Ricky screamed into the reindeer's ass but to no other effect than a short blast into his mouth. The wolf coughed and retched violently as it burned his throat. Of course the taste wasn't very appealing too. 
"I think you should only smell them, everything else could become more torturous than you expect" Santa chuckled upon returning. 
And soon they were up in the sky again, only to land a minute later. 
Dasher, unlike Rudolph again, kept up the same frequency of farts after landing. In Ricky's case that ment more farts during the flights but less on the roofs, in comparison to his time with Rudolph. 
Dasher seemed to stick on known things in general as he wouldn't change the way he farted. Even in the end they would only be louder, wetter and much more potent but the reindeer never sat down. 
More or less used to it, the time with Dasher ended rather quickly for the wolf. 
In fact the real torture seemed to be over when the next reindeer couldn't bring up something new for him. 
Dancer's gas smelled like spoiled milk too but he would fart in a rhythm that was pretty close to Rudolphs. He didn't sat down though. 
Prancer farted constantly with the stench of rotten eggs, finishing off by sitting down. 
Vixen gave him the eggs too, farting constantly but without sitting down. 
Comet had a more potent version of spoiled milk and constantly let it out like Dasher, only sitting down in the end. 
Cupid had milk too and farted way more frequently than the others. What Rudolph did on the roofs, Cupid ripped during flights. 
But it couldn't prepare him for the true torture he was going to experience. 
"Donner likes to treat his fans in a slightly different way... " the panther explained as he fixed the wolf's head to Donner's rump. Only this time his mouth was wide open. 
The reindeer didn't hesitate a second and let out a monster of a fart. Ricky coughed violently due to how thick the gas was, the wolf almost able to chew it. But when he calmed down he was wondering about something... 
"Don't worry, Donner is known to fart up a hurricane, there's no need to feed him that grass of yours " Santa said as, yet again, he went into a house. 
The reindeer grinned when he let out another huge fart into the wolf's mouth, obviously enjoying the situation. Of course Ricky didn't, already feeling very nauseated by the farts. His throat was already very dry when the next fart invaded it and shot into the canine's lungs. 
The situation didn't become better for him when they began to fly again. Unlike the others, this reindeer was farting even more during flights, making the wolf feel very dizzy after 12 houses already. Santa already knew that the wolf won't last that long with him and untied him, only to tie him again a few seconds later. But this time it was his nose that made contact to the ass again. 
"That were 12 houses, makes another 18 in this position! " the panther explained. 
There was one thing that Ricky wondered about 
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And that was how they would take so much time between the houses. But on second thought
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There were huge areas with few houses in the country so it wasn't all that unrealistic. 
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What was unrealistic for the wolf though, was how bad these farts smelled. He didn't have to taste them but the thickness of the gas made it hard to breath. The stench told him that Donner was eating lots of grass before 
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and it didn't seem like it was very fresh. 
Time passed very slowly for the wolf but after what seemed like an eternity the reindeer sat down and began to fart like crazy. Ricky screamed with all the power he had left, meaning that a muffled whining was the only thing for them to hear. 
He was introduced to a last blast of Donner's gas when Santa returned again, before the later untied him again. 
Ricky hoped to get a little time to regain his consciousness completely but the panther had something way more effective in mind. 
The wolf was bound to Blitzen's rump and was met with a very new kind of gas. It didn't even "stink" very much but it was stinging the wolf's nose immediately with it's very pungent stench. 
Ricky sprung back to life and trashed around very wildly to escape from the gases. Unfortunately he was bound very tightly and once the panther tied arms and legs together there was no chance for him. 
Blitzen enjoyed himself a huge amount of the grass and was soon enough ripping a very long, silent hiss into the wolf's nose. 
Whether the wolf had a cold or not, the sharp, eye-watering smell freed his nose completely. Fart after fart followed and each more painful for the wolf than the other. 
Fortunately the panther showed mercy and freed him after 10 houses. At least Ricky thought so at first. 
"Why don't you come into my sleigh? " the feline asked afterwards "We'll finish the tour and I will bring you home. "
Ricky nodded and even smiled a bit. He didn't say a word though when he sat down. Of course that wasn't what Santa wanted. 
"Ho Ho, I think you misunderstood me. I want you to lay down so that I can sit down on your face " the panther said, still warmly. 
Gulping hardly the wolf did as he was told, not wanting to see what disobedience would earn him. Taking a careful whiff, Ricky realized that the seat had quite a lot of gas absorbed. 
The Santa entered and sat down, his belly grumbling immediately after. 
"These kids love to spend milk and cookies, unfortunately my stomach doesn't appreciate it as much as I do! " he laughed before letting out a bassy fart himself. Ricky whimpered due to the combined stench of spoiled milk and rotten meat. The gas was just as thick as Donner's and the panther wasn't holding back the gas. In fact he was pushing out as much as possible due to having just the flights to pass gas. 
While he brought the presents the wolf was granted fresh air (even though the reindeer occasionally farted in his direction).
He didn't dare trying to run away, especially since the reindeer reacted to every tiny move the wolf did. 
Whenever Santa came back his farts would be a bit more potent due to the refills with milk and cookies. It didn't take him more than an hour to knock the wolf out completely. 

In the next morning the wolf woke up in his bed. And just when he wondered if all of this was a dream he saw two presents next to his bed. 
One included a dozen of deodorant and the other one a lot of jars. 
A sticker on each of the jars read "Smelly Christmas from" and a the names of each reindeer, as well as Santa himself. There were three jars for each of them...