Many thanks to user wnxman for their assistance with editing!
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Softly he padded forward in his bare feet, naked as he was. How close could he approach this time before his dragon form overtook him with need? Concentrating, he breathed in the damp air of the cave-like dungeon, large enough for two dragons to spar and mate, though now it only held one.
Three stories tall it was, styled after the days when she-dragons still roamed the mountains, finding huge caverns to brood over their young dragonlets. Even in his dragon form, he could scarcely reach up a third of the smooth walls. He'd grow as he aged, like all reptiles, but for now his size was perfect for taking a fragile human.
Slowly, he stepped closer to his bride. As had become her habit, she was kneeling facing away from him, her bosom flat to the bed and her ass high in the air. He still marveled at how lucky he had been that the human chosen for him not only accepted, but also enjoyed being taken in this way.
He'd heard stories of brides who fainted from fear or screamed in terror, or still others who sobbed wretchedly. It wasn't fair to them, he knew, but without their sacrifice dragonkind would die out.
None of this would be necessary if the humans hadn't slaughtered the last of the she-dragons more than a century ago, curled protectively around her gold and silver clutch of eggs. It was why dragons hoarded precious metals to begin with; they held the heat necessary to keep the eggs warm, while also hiding them amongst a sea of glittering treasure. But this had been their downfall.
Humans had taken a keen interest in their shining troves, which they deemed more valuable than life itself. Or at least more valuable than any life other than their own.
Having lost the last of their mothers, his kind had sworn revenge upon the humans, burning their defenseless towns and smashing their pitiful castles.
This was how they first encountered the intoxicating pull of human females that sent them into a raging lust. Those poor women had been maimed by sharp claws and ripped apart by the furious rutting of his ancestors. But miraculously, one had survived, birthing a dragon's child that took her life entering into the world.
The humans left the squalling babe with a dragon's blazing eyes at the mouth of a cave, and that was when his ancestors devised this scheme: the promise of peace in return for brides.
His kin had slowly learned the best way to ensure the women's survival, but the offspring of a he-dragon and a human was always male. This cruel twist turned what was intended to be a temporary plan into their only means to avoid extinction.
Pulling out of his thoughts, he sniffed the air already full of her scent. Even in human form he could smell her soft breath, her sweet pussy already wet with desire, and the darker musk of her ass.
Focused, he took one step forward, then another. This was the farthest he'd come without being overtaken by the change in these past few weeks since receiving his bride. But his dragon lust was overpowering, and with a resigned sigh he molted into his draconic form: glinting black scales, leathery wings, and a crested ridge running the length of his spine. To a human he might look fearsome, but among dragons he was the peak of virility.
His claws clacked against the stone floor as he prowled toward his mate. He had cut his nails almost to the quick for their first night together so that he wouldn't hurt her with his great talons if she struggled against him. At first he had assumed she was simply frozen in fear, but against all odds, she had enjoyed it!
Of course, he had spent years training himself to resist mounting her like a crazed bull, to take her slowly and gently as she deserved. But she had responded to him in kind, with her body climaxing from his touch alone.
Once more he thanked the stars above and the mountains below for such a wife.
In dragon form he could smell her pores oozing with anticipation, and hear her heartbeat quickening with excitement. No doubt she could feel the heat rolling off him as he approached her.
He growled with desire, but this changed her scent to fear, so he softened his voice to a purr. This made her even more eager, and he watched her squeeze her butt and rotate her hips, as though trying to bring pleasure to her asshole without touching it.
She then raised her ass even higher, presenting herself to him.
He groaned at the sight of her tight asshole slowly opening and closing of its own accord, winking at him like a mare in heat. He stretched forward, licking her there in curiosity. She moaned and rubbed her ass cheeks together, which delighted him.