All living things have needs that must be met if they desire their life to continue. Such needs range from the universal requirement for sustenance, to the more specific, such as the requirement of all higher life to sleep, or even the esoteric, such as the requirement of a pain demon to inflict suffering. The ability to exploit those needs is what separates, to pick a random example, a successful summoner from the shrivelled (but very happy) corpse that had, a few minutes earlier, conjured up a succubus with no plan of how to control her.

The Cruithia Kingdom is well known by its neighbours (or at least, by the subset of them that aren't carbonised silhouettes) for exploiting such needs to bring a shining example of the world's apex predator under their control. For the past hundred years, anyone daring to encroach on the kingdom's territory has found themselves faced, very briefly, by a dragon.

But perhaps 'control' isn't quite the right word, and it's that very dragon that the kingdom's betrayed crown princess is going to need to convince to aid her if she ever wants her position back. A creature of selfishness and pride, evil by any human standard, and yet occasionally steerable by those who know the correct levers.

Not that convincing the dragon to help her take back her kingdom is her primary concern. That accolade goes to the need to convince the dragon not to eat her. Again.
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This is a short story (8 chapters/17k words) about a betrayed princess and an evil dragon. Neither has a particularly great time.

Published here and royal road. If you see this anywhere else, it's stolen.