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Being the head alchemist for the Demon Army came with a surprising number of responsibilities. Tsavo had to ensure the stock of healing potions was full, all the soldiers' wounds were properly treated, perform reconnaissance, and ensure any evidence of their passage was destroyed, all while conducting his own research into potions that could potentially benefit the war effort. He would not complain though; he loved to be of service to the army and the general. Still, the draconic demon loved to work on his potions, and all these pulls on his time made that set aside for experimentation very valuable to him.

Today, that experimentation was going very, very well. After several failed attempts, he was closing in on the recipe for a new potion. Tsavo carefully measured out a portion of ground charcoal. He gave a dissatisfied grunt and tossed it out before measuring out a new portion of it. The demon folded the measuring paper and slowly poured the ingredient into the heated flask containing the unfinished potion. He watched intently as the potion changed from a dark grey color to black. The alchemist groaned; it was another failed attempt. Absentmindedly he stirred the potion, trying to figure out what went wrong. It took him a moment to realize the darkness was now fading from the brew, and it was beginning to shine with a silver inner light.

Tsavo almost froze; then, he nearly tried to stir the potion in a frenzy. He had to take a few deep breaths to control himself, as any change in his stir rate could ruin it. The next few minutes drove his heart to his throat as the potion slowly changed. Once it was reduced to a shining silver mixture, the wind demon pulled the flask off the flame and let it cool. The dragon held his breath as watched it cool, waiting for the glow to fade or the silver to dull. When it did not, he nearly fainted.

Suddenly, that potion became equivalent to gold. With a shaking hand, Tsavo raised it to his mouth. The alchemist hesitated for just a moment. Then, trusting in his skill, he swallowed it whole. The effect of the potion was felt almost immediately, as the dragon's scales and flesh began to feel heavier and sturdier. Tsavo quickly grabbed the knife used to chop up the alchemical ingredients and raised it high. Then, the demon brought it down on his arm with all the force he could muster. He grinned when the blade bounced off.

"I've done it! I've made the Steelhide Potion, ahaha!" His laughter had a maniacal hint to it.

After a moment of elated success, the objective of his work came to the fore. The alchemist turned to his notes and wrote in his last step. "Add 1 measure of ground charcoal to the mixture, then stir at a constant rate over heat until glowing silver," he recited. Satisfied with his recording, he began the task of calculating the materials needed to brew a dose of the potion for each member of the demon army. His elated mood quickly returned, as he realized that it would be a fairly simple task; most of the ingredients were simple, common reagents that could quickly be gathered in bulk. As he calculated the final ingredient, the solvent, he frowned. Now THAT would be rather difficult to get, especially in amounts he would need. He started to pace as he considered how to gather the ingredient. Slowly, an idea formed, and with a happy grin he got to work.

---

Iratu gave a groan as he woke up. For some reason, the general's head was pounding and his vision refused to focus. The demon closed his eyes and tried to go back to sleep; he was probably hungover, and would just have to sleep it off. It took him a moment to realize the error in that thought. He was an Earth Demon; it was literally impossible for him to be hungover, or at least to be hungover and conscious of it.

Immediately, Iratu tried to jump into a fighting position, but found himself restrained. It took his foggy mind a while to work out his situation. The Earth Demon general was bound to an X-shaped cross, made from iron and wood. While his feet were on the ground, the demon's wrists and ankles were in iron cuffs, directly attached to the iron frame of his prison. His neck, thighs, tail, and waist were held tight by lengths of rope and chains covered his claws, leaving his teeth as his only weapon. Try as he might, Iratu was thoroughly trapped, unable to move anything more than his head.

Reduced to simply surveying his surroundings, the general tried to get his eyes to focus. Slowly, his command of them returned and he quickly deduced he was still at the demon army encampment. While that removed the worst possible situation of angelic attack, it still did not explain Iratu's current situation. He needed something he could recognize to know where exactly he was. After a few seconds of effort he finally made something out. Suddenly, his eyes snapped open. The sight of his head alchemist wearing nothing at all tended to do that to him. It also helped him find his tongue.

"Tsavo, what's going on? Why are you naked?"

"Oh, you're awake! Good morning general."

"Tsavo..."

"Right, sorry sir. I simply figured this would mean less clean up and make things easier."

"... What 'things'?"

"Well, harvesting your essence for one."

"Harvesting my WHAT!?"

"General, please! People as still sleeping!"

"I DON'T CARE IF PEOPLE AR-MMPHM MMM!"

Two flaps of his wings had bought Tsavo to his general's mouth. He swiftly grabbed the length of rope he had left draped over Iratu's shoulders for just this situation and, in a show of strength that surprised the Earth Demon, wrapped it around the loud mouth. After tying a knot in the rope, Iratu was muzzled and could no longer speak, although his glare spoke volumes.

Tsavo landed gracefully in front of the Earth Demon and took the chance to appreciate his work. Before him was a black and white Earth Demon that stood at over twelve feet tall, unwillingly bound to a cross of his making. It had been trival too. Knowing Iratu's weakness for alcohol, the alchemist had simply slipped a deep sleep potion into a gifted drink. Once the general fell asleep, Tsavo went into his room and exploited his inside knowledge one Iratu. The dragon twisted the moon emblem in the center of the general's harness, and suddenly the Earth Demon shrunk to half his size. After gulping a potion of minor strength, the Wind Demon picked up the six foot Earth Demon runt and carried his unconscious body back to the lab. After laying Iratu in the center of the cross that would hold him, Tsavo returned him to normal size and quickly restrained him. After that it had been a simple matter to lift the cross and the huge Earth Demon with a pair of weighted pulleys. Shortly after that Iratu started to stir.

That was more than enough time spent basking in your own accomplishment, he chastised himself, you have work to do!

Oh, what a job he had before him. The key ingredient to his formulation of the Steelhide Potion was the use of Earth Demon essence as the solvent, with solvent meaning what all the other ingredients were put in and essence meaning cum. While the essence used in his experiments had been a generous donation from another member of the army, this would require massive amounts.In order to make a single dose of the Steelhide Potion for each member of the army, Tsavo would need gallons upon gallons of Earth Demon semen. Thus, his creative mind had turned to the largest, most well endowed Earth Demon he knew: Iratu. It had taken him some time to prepare everything, but now, the alchemist was ready.

The task of getting the extra large cast iron cauldron into position was the first thing on Tsavo's list. Using the last of the strength potion, the Wind Demon lifted the massive vat into position in front of his captive audience. The dragon then positioned the pump and connected its tubing, ensuring the essence would be collected. The pump have been a simple day of experimentation with wind crystals; the tubing had been a nasty process of cleaning and curing the guts of one of the army's meals. Finally, the cock sheath had to be placed over the general's hardened shaft. After that, there were just two steps between Tsavo and all the Earth Demon essence he would need.

There was just one problem with this plan: Iratu was still as limp as a noodle. Of course, that was no obstacle to Tsavo, the head alchemist of the Demon Army! While it was true that the Wind Demon was asexual, that did not mean he was ignorant as to how to please a male. In fact, with all the time Tsavo spent around Iratu and Azurai, he was nearly an expert!

Tsavo slowly approached his general's sheath as he decided on his approach. With a hint of trepidation, he gently pulled back Iratu's sheath and kissed the tip hidden inside. The snort he got in response sent a shiver of pleasure down his spine. Iratu had liked it. With sudden gusto the alchemist got to work, licking and servicing his general's cock. Slowly, steadily, both of the demons became more aroused. The dragon put his knowledge to good use. While he had started stimulating just the general's tip, as soon as he gained confidence he reached deeper, stroking Iratu's hardening shaft with a finger. As his penis grew past his sheath, Tsavo lavished it with attention, licking as far around it as he could. Once the bulbous bit of flesh that formed Iratu's knot was exposed, he wrapped his hands around it and rubbed the rest of the shaft with his arms. The Wind Demon licked, rubbed, kissed, stroked, and serviced every inch of his general's cock. It was only the Earth Demon's rapid breathing that stopped Tsavo from going too far and brought him back to the task at hand.

After shaking the desire in his loins from his head, the alchemist grabbed the cock sheath and pulled it over the Earth Demon's shaft. An iron latch secured the ring of the sheath's nozzle by going behind Iratu's sack, using the unmovable mass of his balls to hold the whole thing in place. Still, it wasn't totally secured, so the resourceful Wind Demon sealed it tightly by wrapping some rope around the sheath and behind the general's knot. That made for an airtight seal, ensuring the needed suction.

Now it was time for the pump to do its part. To start the machine, Tsavo gently blew into an opening in the pump. Soon, air could be heard moving inside the device and, at the flip of a lever, the tube leading to the Earth Demon's cock tightened. As Iratu gave a huff and whine, his entire shaft was squeezed by the machine. Then, a second later, it relented, and the tube filled with air. Iratu gave a sigh of relief before it constricted again and he gave a moan of dread. This was going to be long night.

Tsavo was not planning for a long night. After ensuring the pump was functioning properly, he went back to his potions. After a second of browsing the alchemist selected a bright pink potion in a large round flask. The Wind Demon took to the air when he returned to his general The dragon uncorked the flask and gave it a sniff, to ensure it was the potion he thought it was. Satisfied that it was, the alchemist pulled back the demon's gums and poured the lust potion into the general's mouth. When the bottle was nearly empty the bound general suddenly shook his head, knocking the bottle from the Wind Demon's hand and splashing some potion on his snout. Tsavo glared as his prisoner.

"You had better swallow all that, or I swear, I'll-"

A quickly gulp killed the threat.

After landing down, Tsavo watched and waited for the potion to work. It was a short wait; within five rounds of suction and release, Iratu was breathing hard as he struggled against the coming orgasm. While he was annoyed, the alchemist was patient. Soon the demon came and the pump collected its first sample of Earth Demon essence. At first, Tsavo was pleased. A glance into the cauldron ruined that pleasure though, as the essence was just a small pool in the bottom. It would take a lot more orgasms to get all the semen the Steelhide Potions required, and the dragon was not that patient.

Another round of browsing revealed that Tsavo had no more lust potions, and making more was out of the question.There simply was not enough time for that. This left the alchemist in quite the pickle. He wanted this done tonight, especially since he knew Iratu would not agree to a second milking; after all, there was a reason Tsavo had kidnapped the general in the first place! A low moan from the demon in question caught his attention and he watched as the huge Earth Demon delivered another load to the pump milking his cock. As he glanced at his general's face, a memory surfaced of a time he had been coerced into watched Iratu and his boyfriend Azurai fuck. It had been a simple blowjob after a long day of torturing souls in Hell, but the amount of cum Iratu produced even then had astounded the Wind Demon. A new plan came together in Tsavo's mind.

The alchemist returned to his spot underneath his general's member. While the pump nozzle was sufficient stimulation to get Iratu to orgasm, Tsavo quickly concluded that more could be done. And, that it would have to be done manually. The Wind Demon reached up and gently wrapped his hands around Iratu's swollen knot, covered by the cock sheath. Even a small squeeze made the demon general groan in pleasure, and once the dragon added rubbing to the mix the Earth Demon quickly gave up his load of essence. Grinning, Tsavo took to the air again so he could work the shaft from above. For a moment, the Wind Demon saw the bare flesh of his general's cock exposed at the base of his shaft, hidden behind the folds of his rolled back sheath skin. Without a thought the alchemist leaned down and started to lick the exposed cock-flesh. When Iratu tried to thrust in response, his grin only grew wider.

"You're enjoying this, aren't you?" he asked.

The Earth Demon looked down at the little demon and huffed. Tsavo gave the knot another squeeze and the huff became by a desperate whine. Then he tried rubbing the tip of Iratu's cock and that whine jumped a few pitches. Another glance up revealed the transformation of that angry glare into a desperate plea. A small pit of concern began to gnaw on the dragon's heart. With a few wing flaps, he was level with the general's gaze. He gently stroked the larger man's muzzle.

"Don't worry sir, I just want to collect your cum," he reassured his captive. "In fact... why don't I call you Master? Yes... that sounds right." Tsavo kissed the Earth Demon on the nose. "Master, I promise you that everything will be alright." He dropped back to hover above his master's cock. "Just cum if you agree," the Wind Demon smirked. He returned to ministering to Iratu's cock, licking the exposed base with his tongue and rubbing the knot with one hand while the other fondled the tip. Within moments, a sudden twitching and throbbing of this affection's target sent another load of essence into the cauldron. He looked up at his new master with a smile. "It seems we have an agreement then," he noted, as the dragon's own cock slowly started to emerge and harden.

The Wind Demon continued to work from his spot above his master's cock for a few minutes. It was enough that another load was drawn out, but it took longer than the first. Concerned at this trend, Tsavo looked for another spot to please. The Earth Demon's shaggy balls were the first thing that drew his attention. He slipped off the milked cock and lifted the heavy sack. He barely moved the seed-filled sack but the general gave groan of pleasure. Content with his new selection, Tsavo put a hand to work, fondling his master's balls. After a few seconds, a thought occurred to him.

"Master, has Azurai even pleased you like this?"

He fancied that the snorted reply meant no.

"I thought not. That nitwit is too dull to consider pleasing every part of your body." The dragon gently squeezed the general's balls together as he ran his tongue up the crease between them. "I, however, am." He slowly raised his lips higher and higher, servicing his master with his tongue as he went. After releasing his grip, he tried rubbing his nose in the fur of his master's loins, and the moan this produced convinced him to do more. Soon his nostrils were buried just underneath Iratu's cock. To Tsavo's surprise, the musk there was incredible, a deep calming scent with a masculine overtone. Nuzzling into the source of the smell, Tsavo failed to miss his shaft harden. Iratu gave the machine another load of his essence.

The dragon quickly turned his affection to the other side of the general's sack. Starting from the back, the first spot he serviced was the taint. He lapped at his master's flesh and fur, slowly working his way towards the backside of that heavy sack. A light nip to the top of the sack, just under the iron latch of the sheath, made Iratu grunt in a strange mix of pain and pleasure. Then Tsavo returned to servicing his master with his tongue and face, licking and nuzzling the Earth Demon's essence-maker. The dragon's tongue swirled over the heavy balls, his snout nuzzled between them, and his hands stroked the fur covering them. As the Wind Demon lifted those balls with the bridge of his nose, they convulsed, and another load was given to the cauldron.

Iratu moaned as Tsavo returned to his cock with a stroke along the side. His master still needed to be milked further, so the dragon started to lick along the bottom of the shaft while rubbing the sides. After a minute of that he moved to longer hand strokes. Since this freed his head he began kissing the cock. After a few smooches, the dragon started talking.

"I honestly don't know what you see in that idiot Azurai. He's reckless fool who has caused far more trouble than he's worth." He paused here to lick along his master's shaft, slowly dragging his tongue along both sides of the hard cock. Iratu started to growl and fight against the bonds holding him as Tsavo continued. "Why not just ditch the fool for someone smarter, more obedient, more faithful?" He gave the general's tip a quick kiss, despite the way he raged above. Slowly he enveloped the front of the shaft in his maw, letting his tongue lick the entire length. When the Earth Demon came a few seconds later, it was still there. "I mean, I've got everything you need here, right Master?" The glare Iratu gave him simply burned with anger... and lust.

The night continued on like this for a while. Unable to escape, Iratu had to simply bear out Tsavo's ministrations. The Wind Demon refused to stop though; he just kept licking, fondling, rubbing the general's sex, milking every drop of essence he could. When he stopped, he would just insult the Fire Demon that was Iratu's partner, all while acting as if he was the one being submissive. At some point, it just became a blurred memory.

The sun was just starting to peak over the horizon by the time Tsavo realized the cauldron was full. He blushed a little when he noticed that it had even overflowed a little. Immediately he jumped off Iratu's cock and started turning off the pump. After opening a few covers a short burst of wind blew from the device as it deactivated. From there came the long process of unbinding the general. After freeing his penis from the cock sheath, the first thing Tsavo did was remove the rope he had used to muzzle Iratu.

"Are you okay sir?" he asked as he stroked the Earth Demon's cheek.

"Just... get me out of this thing and I will be," he replied, wearily.

"On it."

From there the Wind Demon resumed his work, unbinding Iratu's claws, neck, waist, tail, and legs. The ropes and chains fell to the ground, discarded. Done with the easy parts, he then moved on to the cuffs, first unlocking each arm before taking care of the legs. When the general fell to his knees, Tsavo was immediately below him.

"Iratu! Here, let me help you!"

"Oh, you'll do more than help me," the Earth Demon replied. A chill ran down Tsavo's spine. Iratu suddenly had a VERY different tone to his voice. Before he could react, the larger demon snatched him up by the waist.

"What the fuck Tsavo!? You kidnapped me in the middle of the night so you could collect my cum!?"

Tsavo struggled in vain to free himself from the general's claws. "I'm sorry sir, but-"

"No buts about it!" Iratu snapped back. A grin slowly split his face. "Actually, one butt about it. Yours."

"What!?"

"If you want my cum so badly, I'll give it to you. Directly."

With that, Tsavo was flipped over. A pair of heavy hands gripped his legs was he was spread wide, leaving nothing but his tail to protect his anus. A thumb took care of that and pinned his tail up. While the alchemist tried to beg for forgiveness, he felt the Earth Demon's cock rub between his butt cheek, lubing the area with the cum still clinging to Iratu's dick. A single digit, Iratu's other thumb claw, pushed at his pucker, forcing his anus to spread open. As it pulled out he whimpered at the sensation of the cool night air inside his ass.

He tried to brace himself for what came next, but failed. Nothing could have prepared him for getting pulled onto the cock of a huge, horny Earth Demon, short of the event itself. As Iratu forced just the head of his shaft into his ass he screamed, waking half the camp. It was far, far too much cock for the Wind Demon. It was also too much for Iratu. Penetrating such a tight hole pushed him over the edge and he came inside the dragon.

Tsavo groaned as his belly stretched and deformed to accommodate the load of Earth Demon cum filling his ass. It was all far, far too much for him. The stretching of his hole, the cock inside him, the warm gooey cum filling him, the liquid pressure against his prostate, it was all too much. He came, shooting a heavy shot of Wind Demon essence to the ground. He moaned as it splattered on the ground, wasted. A few more shots followed the first, and each met with the same fate. He tried to turn and face his general.

"Please... Iratu... no more..."

"Oh, so you think ASKING is gonna work? Too bad!"

Iratu had quickly noted that by pushing Tsavo up against the cauldron, he could free up his hands while still fucking the alchemist. The dragon barely managed to get his arms on the filled pot when the general swung him over. As the Earth Demon started to push forward and sink his cock farther into the alchemist's asshole, an idea struck. An awful, horrible, cruel idea.

"Tsavo, let me make you a deal."

"A-anything."

"If you swallow a huge mouthful of that cum you collected, I WON'T knot your sorry ass."

There was no hesitation. The dragon craned his head over the cauldron of cum and shoved his head down deep. Seconds later he reemerged, cheeks full on semen. It took several long gulps, but he swallowed it all. Before Tsavo could show the general his empty mouth though, Iratu grabbed his head and shoved him back under. Reflexively the Wind Demon tried to knock away the hand holding him down, and that mistake cost him. Without the dragon's hands to stop him, the Earth Demon slammed his chest against the cauldron. The alchemist gasped as the air was knocked from his lungs. He would have shrieked a second later when the general sank his massive cock a few inches deeper into his ass, but the air was gone. After a few more seconds of flailing, Iratu pulled his head out of the cum.

"Breathe," the Earth Demon commanded.

Tsavo did not need to be told twice. He immediately took a few deep breaths. It turned out to be an excellent decision, since the general immediately put his head back under the essence. While he batted at Iratu's paw, another part of him prepared for a few more inches of cock. After a few seconds of nothing happening, the dragon started to relax. Perhaps this time Iratu would leave his cock where it was. As the seconds stretched on, a new fear started to arise. His air was running out. The Wind Dragon's struggles were suddenly renewed as the need to breathe became more urgent. Just as his lungs started to burn with the need for fresh air, the cock buried deep in his ass moved a few inches deeper. As Tsavo let out a scream under the essence, the general's cock struck his prostate. He came, shooting yet another load of his Wind Demon essence on the ground. This, in turn, made him tighten down on the shaft buried in his ass, which brought Iratu to his own orgasm.

The alchemist's head was finally pulled out of the cauldron of cum just as his gut received a new load of it. He groaned as felt his belly sag. He felt like he had just eaten an enormous meal, and the general was certain to push him further. For now though Iratu just held his head back, forcing him to look upwards. The Earth Demon cum covering his face and muzzle was starting to move, both going lower on his body and seeping into his pores. Every time Tsavo tried to inhale through his nostrils all he could smell was Iratu's cum. It was an earthy scent, much like the ground after a light shower, with just a hint of brimstone, a trait all demons shared. While it was not exactly an unpleasant situation, inhaling cum was, so Tsavo did his best to breathe through his mouth. Once the Earth Demon was finished unloading into his gut, he let his prisoner breath for a few more seconds; then the Wind Demon's head was back under the essence as a few more inches entered him.

It took two more rounds of nearly drowning in cum for Tsavo to feel Iratu's knot bum up against his ass. By then, at least one more load of Earth Demon essence had been put inside him, and his belly ballooned below him like a pregnant demon. While he feared for a while the general would break his promise, the dragon was relieved when he felt the cock being pulled back. As it went it pulled the cum with it. When Iratu's cock popped out of the alchemist's ass, it was followed by a stream of semen. It ran down his legs and cock on the way to the floor as he shuddered in pleasure. This quickly ended when, once halfway empty, the cock got pushed back in his ass.

This time Tsavo was being properly fucked. Before, he had simply been a cock sheath, a hole the Earth Demon could shove his cock into and be pleased. Now the Wind Demon was being properly fucked as the general thrust slowly into his well-stretched anus. It was impossible for him to fight back; he was too tired, too used, too weak. All he could do was ride out the ravaging of his ass, groan softly as a weak orgasm was forced out of his cock, and wait for the end.

Iratu did not keep him long. The first warning sign was when he started to huff and puff with his thrusts. Soon after he fell to groaning and moaning, as he started to pick up speed. The only warning given to the alchemist though was muted roar. The general thrusted all the way up to the knot before blowing his load. The Wind Demon could only shout as a heavy load of cum filled him, each shot pounding the walls of his gut. Soon his belly inflated back to the size of pregnant demon, and then a little beyond.

After the Earth Demon finished enjoying the afterglow of a good fuck he dismounted the used dragon and let him lay on the ground, belly down. While Tsavo shuddered from the sensation of cum running over his balls and sensitive shaft, Iratu rummaged through the potions. He brought a green potion over and put it to the alchemist's mouth. The taste of a healing potion at his lips was a blessing he could never match.

"You get the day off, but I want an explanation by tomorrow night. Got it?"

A weak nod was Tsavo's only response.

"Good. Now, if you'll excuse me, I need to go find Azurai."

While Iratu went to find his boyfriend, shouting about how he was "going to fuck your tight little ass 'til you pop," the Wind Demon tried to move. After what felt like a half hour he manages to get his arms on the ground in front of him. When he tried to sit up he must have clenched his gut. The renewed trickle of essence over his cock set off an orgasm from his oversensitive cock and balls. Tsavo groaned.

It was going to be a long day.