Reuster is a red dragon who has trouble breathing fire, but when his master finally shows him how to do it, it backfires....LITERALLY.

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Reuster was just a normal, growing dragon living in the medieval forests of Glonhare. The scales coating his whole body were dark red, he had blue eyes and a long tails with spines on the back of it going all the way up to his neck. The five spines on his head were a lot bigger though, at least nine inches or a foot. He was about sixteen years old in human years, and he was quickly getting older everyday. However, it is because of his age that presents a very, very big problem for him: he can't breathe fire yet.
It was today that Reuster was to meet with an elder dragon and learn to breathe fire. One of many coming of age rites for dragons. In the forest clearing he would be taught by Ewik, who was perhaps ten times the red dragon's age. He stood waiting for the dragon to arrive, impatiently grinding his claws on a nearby stone. He was not one to be kept waiting.
Reuster hastily flapped his wings through the air until he caught a glimpse of the giant elder dragon sitting in the forest, grinding his claws on the stone. He knew that he was late for his training, again. But it was alright, as Ewik was known to be a forgiving dragon. ...Or was that the old guy in the village who sold him tacos?
Ewik grunts after Reuster lands in the clearing. "You are late, Reuster. Try not to make this a habit, or I'll cinder your hide next time. Now," he says, the giant beast moving around the red dragon and observing his form. "Today you will finally learn to breathe fire. It's a matter of activating the special organ we all have into your breath. Are you ready?"
"Sure, sure, yeah. I'm always ready to learn new techniques!"
Ewik stops in front of him. "Alright. Let me demonstrate. Breathing fire involves moving deep within your gut, as if you were to belch. But the movement for fire comes naturally to us; it's all about simply working the right muscles." Ewik demonstrates by rearing his neck back and making his mighty chest visible, before he blasts a large stream of fire from his mouth near Reuster. Once that impressive display is over, he sits back. "You try."
"Okay, I can do this, I can do this." The adolescent dragon jerked his head around like Ewik did, but he moved too quickly and didn't puff out his chest enough. As a result, the dragon did nothing more than exhaling hot breath into the air with a loud wheeze.
"Like this, like this!" Ewik barks out, thumping his own chest while pushing it out. "Keep trying though. Sooner or later they all get it." He is not sure about this one, however. They said he should have been spewing sparks before this time like the rest of them. But Ewik was not one to give up so easily.
"Oh, you mean like this?" Reuster puffed out his chest correctly this time; however, he forgot to veer his head back a little and didn't inhale sharply to collect any oxygen. Once again, the small red dragon did nothing more than shoot more pungent hot air from his mouth.
Ewik shakes his head and snorts fire. "No, no. Quicker breaths, lad. That's the key, can't get fire without filling oxygen into the flame sac." As he lectures, Reuster may feel his lower intestine gurgle, very slightly, almost unnoticeable.
"All right, all right ya old coot. I know how to do it now." The dragon inhaled a good supply of oxygen and veered his head back a little, with his chest puffed out and his cheeks blown up. Then, using all of his power, he blew fire for four seconds. Everything went perfectly...except it came out the wrong end. It wasn't until Ewik heard a distasteful trumpeting noise and began to smell brimstone that Reuster didn't exactly breathe fire. Rather, he passed it through his bowels and out the anus.
Ewik contorts his face a little, but is immediately shocked by the unusual thing he sees. "What the? Boy, you've just done it in reverse. I've never seen that before in all my life!" Ewik has broken plenty of wind himself, which the other dragons would be quick to remind, but he's never seen anything like this. "What is up with you anyway?" he demands.
"I-I-I...I dunno! I did exactly what you said! I inhaled oxygen, I puffed out my chest, I veered my head back, but for some--" Reuster was interrupted by the seismic churning in his bowels. "Oh, my stomach..." The young dragon shut his eyes and passed some more fiery gas, this one more powerful and stronger than the last. It also seemed to stink a lot worse too; even Ewik looked a bit disturbed by the stench.
Ewik holds his nose. "Damn, boy, what have you been eating? You'll never be popular if that's how you do it!" Reuster may feel increasing pain pressure in his gut like constipation, but it's only gas. Just hard to pass, now that he has discovered this new power. How much harder will the fire come out?
Reuster felt way too much pain in his innards like someone was practically shoving bowling balls through his bowels. The dragon groaned loudly and laid flat on the ground and on his gurgling belly. Right then, he felt the burning sensation in his rectum and, with no alternative, let all of the gas and fire out. The smell was like acid, nearly burning through Ewik's scent glands. There was enough fire to burn down a cabin in one fell swoop and if Ewik had been standing behind him he may as well have been on fire, even though the elder dragon was over five feet taller than the young lad.
Ewik can barely contain the stench or even the acridness, but he knows Reuster's in a bit of a bind. "Control it, Reuster. Don't let the fire overwhelm you! It's like if you were breathing it, I've seen it before. Don't let your farts kill you, is what I'm saying!"
"How do I control myself from farting?!!?"
"Don't be an ignoramus, boy," Ewik snaps. "It might be painful, but remember, master the flame!"
Before another fart could fly out of the young dragon's ass, he inhaled sharply and closed his cloacae, quickly sitting on his red rump in order to contain the fiery gas. It took him a while, but eventually, the gas subsided. ...For now, anyway.
Ewik nods and approaches Reuster. "Well, not what I expected, but I hope you've learned from today."
"Yeah, I learned my ass is a lethal weapon, and not just because of how rank it smells. Although I am curious, how come you can't expel fire from your butt?"
Ewik snorts. "Not how I'm built. But you? You're different; no one else can do that. All I can do is knock out all living creatures in a mile radius whenever I feel the pressure. But I've never burnt down trees. Reuster, you might have a unique position above your friends."
"Hehehe, I guess I do. Then again, the last time I saw you pass gas I could've sworn one of these trees withered within two seconds." Reuster smiled. "Perhaps I should use this talent for my own, uh...agendas."
"Bad cow I ate," Ewik says, rubbing his gut. He lifts a claw and pats Reuster's shoulder. "Sure, just don't hurt yourself. I'll watch over you, kid. In the meantime, you'd best get going. I have more to see for the day."
"Hey, before I go, you think I could see you in action? I mean I know I can fart fire, but if your farts smells as bad as the other dragons say..."
"Wait until after dinner, I'm not your personal entertainer," Ewik grunts, shaking his rear. "I'll see you later, kid."
"Aww. Okay Elder Ewik. See you later!"