Many thanks to users roftlheory and pU55wetNcreamy for their assistance with editing!
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She lay spread-eagle on the bed as she had been instructed. She'd been told not to move, lest she interrupt the dragon's passion and suffer a grievous injury. She knew he would take her in the rear, as the dragon's attendants had spent days preparing her asshole. It had been deeply humiliating, letting them fill her with bulb-shaped instruments, first small then larger and larger until she wondered at how her body could spread so wide. At least now she was ready for him.
She had been terrified, when she first received news that she was chosen as this year's tribute to the dragon lords in the mountains. Her mother had wailed endlessly and her father had sat stony-faced with shock. But this was their homeland's agreement to keep the dragons at bay: send tribute every year or else have girls disappear without warning. Not that she was a girl; she had seen twenty-one summers already. Perhaps if she hadn't waited so long to get married, at least she would have a human for a husband instead of a dragon.
No dragon's bride ever returned from the mountains, that was all anyone knew. She shivered with cold, despite the sulfurous warmth in the air against her naked skin. Once chosen and delivered, they were never heard from again. Did they die, consummating their marriage? Were they eaten afterwards? Both possibilities were horrifying. She swallowed and tried to breathe deeply, as the dragon's attendants had taught her: in slowly, out slowly, to still her frantic heartbeat. They hadn't said anything of what would happen afterwards, so perhaps there was hope... or maybe there was no point in telling her she was about to die.
No, she thought, shaking her head. It was more likely that the dragons held on to their prized brides just as jealously as they guarded their treasure hoards. That was how her people had first encountered them: Raging against human incursions into their territory, giant scaled beasts as silvery in the sunlight as a fish, but as lithe and deadly to a person as a cat to a mouse. They had long, lizard-like faces and big, sharp claws. Sitting on their haunches, they were as large as a doorway; standing full height, their clawed wings could reach the roof of a house. She shivered again. She could only imagine how large his male organ would be.
She heard a low rumble and was hit by a wave of warmth; he had arrived! She shut her eyes, not wanting to see how large and frightening he was. She could feel him grow closer and closer, as the heat rolling off his body grew more intense. Suddenly a clawed hand was at her side, gripping her gently despite its size, and flipped her over on the soft bed. It was joined by a second, now both pulling at her hips. He meant to take her from behind, she realized, just like a dog or horse.