One day, the famous horse-knight, nicknamed “The destroyer of dragons” was looking  for the last dragon, named Tabaluga. The had successfully slain hundreds of dragons, ridding the world of those evil beasts, he only needed to slay one more. Since Tabaluga was just a child, it didn’t seem much of a problem. However, that child was the meanest, most evil of them all. He often robbed shops and houses, and burned it’s inhabitants, with fire coming out of his mouth while he was laughing. Unlike other anthropomorphic creatures, but like all dragons, Tabaluga was completely naked all the time. He loved demonstrating his perfect body to everybody. And as such, he was a complete slut, preferring to ride his victim’s dick before burning them. The dragon would receive the sperm deeply inside him, and burning him or her right after that, while laughing and grinning evilly.
However, John, the destroyer of dragons was naturally immune to fire, which allowed him to survive all the encounters with those evil beasts and overcome them.
On that day, John had finally found Tabaluga, who was stealing from yet another home, while grinning. The horse knight yelled “Face me, dragon!” with Tabaluga flying up in the air, and saying :
“I heard of you, horse knight *grins*, I can see you haven’t even brought a shield with you,  let’s see what you say about my fire!” and breathed fire at the stallion, grinning as always while flying in the air above the knight. John didn’t cover himself from the fire, as he was immune, and the fire hit his neck and mostly exposed chest
“What?!” the smile was gone from the dragon’s face “It’s impossible! You horses are…”
“I was born immune to dragon fire, you beast, so you can’t hurt me!” the knight interrupted him. 
The dragon smiled again: “Well there is nothing you can do about me! I’m in the air and you’re… AAAAGHH!” John threw the sword right into Tabaluga’s chest, interrupting him again. It hit the dragon’s belly and knocked him on the ground. The sword however, did no damage to the reptile.
After coming to his senses and lying on his back on the ground, the evil beast grinned again and said “don’t you know? My dragon skin is impenetrable! My body is perfect! Look at it *spreads his legs as he keeps exposing himself proudly* so there is nothing you can do to defeat me!”
“Oh there isn’t?” the knight objected “I have slain hundreds of you. ALL of you dragons are sluts and can’t resist from being penetrated. So I’ll fuck you to death, ridding the world of your evil, reptile!”
The knight started taking his huge cock out of his pants and fapping it
“Oh really? *grins and erects* let’s see how that works for you, knight. And *approaches the stallion on his knees I will even help you with it *grabs the knight’s huge dick and masturbates  it* mmm so warm” Tabaluga rubs the huge cock around with his little child’s hands, then, looking into the knight’s eyes, takes it in his mouth and starts sucking it. First the tip, then takes it behind his cheek, like the slut he is
“Mmm…. Mmm what a delicious sausage… One of the best I’ve tasted so far”
“And your last” – the knight assured him
As a dragon, he always got aroused by the thought of being slain, so he erected to the full after hearing that, and started fapping himself while moaning, even spreading his legs a little, but staying high enough to reach the tall, muscular knight’s cock. After a minute of taking the dick behind his cheek, Tabaluga felt his head grabbed and the huge, long dick forced down his throat. Slowly but surely, the thick, long dick went down the dragon’s throat, making both the knight, and the dragon incredibly aroused, with Tabaluga breathing heavily, while grabbing the knight’s muscular thighs tightly, while the stallion was controlling his scaly head, pulling and pushing it towards his crotch.
Finally, in a few minutes, the horse night pulled his dick out of the dragon’s mouth, grabbing the reptile’s body by his sides, and, pushing the child against a wall saying:
“Now, it’s time for your demise, beast!”
Tabaluga, grinning, spread his legs and exposed the hole at the base of his tail
“Oh, you can try that, knight”
The destroyer of dragons started slowly pushing his huge cock into the dragon child, who was less than half of the stallion’s size. 
“nngghh… you’re… thicker than others…” Tabaluga exclaimed between moans. 
The little dragon was caught offguard with this, he didn’t expect the knight to actually have a chance against him. The deeper the cock went inside his belly, the more he moaned and squirmed in the hands of the knight, being impaled onto the horse knight’s cock, who was tirelessly fucking him against the wall, pushing the member deeper and deeper with each push, with now most of it being inside the dragon
“Ngghn… you can’t… defeat meeee… aaaah…”
“is that a doubt I hear in your voice?”  - the knight grinned for the first time “You will die today, and there is nothing you can do about it”
Tabaluga’s cock was throbbing heavily, and he was squirming more and more of arousement, his hands caressing the powerful, muscular body of the hero. The cock was entering him almost fully now, nearly tearing the dragon’s insides apart, the huge dick hitting strongly against his organs. Tabaluga started rubbing his own body now, his sides, his chest and belly, adoring his own naked appearance and reptilian perfection. Meanwhile, the stallion was reaching the climax. He grabbed the beast’s sides as strong as he could, saying
“Prepare to die, dragon. Your evil kind is finally going extinct today”.
Tabaluga was too aroused to answer, weakened by the penetration. Finally, John, he Destroyer of Dragons pushed as hard as he could, fully entering his huge, horse cock into the reptilian monster. 
“AAAAAAAAAAAAAAAAAAAAAAH!” The Tabaluga screamed, while breathing out fire in the air, as the cock entered him the hardest and filled him with lots of sperm, with some even dripping out of his hole.
A few moments later, Tabaluga raised his head, weakened, and said while grinning 
“See?  You  can’t kill me. Give up, knight!”
The stallion became angry, and, grabbing Tabaluga’s head, started beating it against the wall
“AH… AAH!” the dragon screamed every time, aroused again by the knight trying to crack his skull. He started fucking the dragon again, in hope to the defeat the beast. The dragon’s scaly head was slamming against the wall for minutes, but there was no effect, his body was too strong for it. 
“Admit it, you can’t kill me” Tabaluga said grinning and spreading his legs “Oh poor, pathetic knight, unable to finish his job. Admit it, you’ll fail and will continue hurting the innocent, and there is nothing you can do about it!” the dragon laughed, like a true villain while breathing fire again
“I will rob, kill, burn them and… aaakkh!” the dragon started chocking, as the knight pushed both of his hands against Tabaluga’s neck, suffocating the reptile
“I HATE YOU!” The stallion said as he was squeezing the dragon’s neck as hard as he could, occasionally beating Tabaluga’s exposed belly with his fist at full strength. Tabaluga started suffocating, moving his legs around, trying to escape, and trying to push the knights arms away by his weak, yellow, child dragon hands, while wrapping his long, thick tail around the hero’s leg. But it was no use, the knight was too strong and muscular, the kid couldn’t do anything about it. He erected fully again, realizing that he’s dying, and cummed, all over his belly and tail, and the cum was dripping down his tail. Finally, after a few more minutes, the dragon completely suffocated. He closed his eyes and lowered his head. 
“Finally” the horse knight let the dead dragon’s body go, as it fell on the floor “the last dragon is dead, and the land is safe!”