Writing prompt 2024-09-02:
Vampires and fairies have their own rules and customs that have been strictly adhered to over the centuries. Vampires who have bitten a creature can appropriate it as a subject. Among fairies, the custom is that if someone eats or drinks something from the Fair Folk without explicit permission, they become submissive to the Fair Folk.

Situation: vampire bites fairy. According to vampire rules, the fairy is now a subject of the vampire, because bitten/drunk blood. According to Fair Folk Customs, on the other hand, the vampire must do what the fairy is now territory, because the vampire has consumed some from a fairy without permission.

How do they resolve this? Who wins? What gets involved?

this story is also available (in way better readability):
https://tretron.me/uncategorized/wr.....pires-and-fae/
https://www.sofurry.com/view/2176577
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The city buzzed with energy under the stars. The heat of the summer sun warmed the city even with the moon and the stars well above the stars. The city was an organism, the alleyways and roads where her veins, the people it’s blood. But like with every organism, there is more going on than a first inspection would hold. Tonight, a tall woman in a black leather coat walked along the alleyways. She was hunting for something and she peaked what might have been a good prey for her. Seraphina enjoyed hunting at this hour, where there was just enough shade to protect her from the sun, but it was still bright enough that people did not expect her.
In the distance she found a smaller woman, alone, with bright blue eyes that seemed to glow in the twilight and golden hair that fallen from her head and onto her shoulders into soft waves. Seraphina licked her two long teeth and moved swiftly. Closing in the distance with superhuman speed and sinking her fangs into her neck before she could react. When the first drop of blood touched Seraphina’s tongue, something felt strange. She could barely drink two drops before a rush of power pushed through her. Pain shot down her spine and she staggered back.
The short women touched the bite mark and smiled. Revealing sharp pearly teeth while he turned around with a devilish smile. “Oh, my little vampire, do you even realise what you have done?”
“You…you are mine now,” Seraphine stammered, still collecting herself from the pain. Trying to ignore the strange sensation that coursed through her veins. “You belong to me now.”
The women chuckled, her laughter like the chiming of distant bells. “Oh my little vampire, you do not know who you’ve bitten. I am Lysandra in the summer court. By the ancient fae law, anyone who consumes fae food without permission is bound to serve the fae they wronged. And as you see me as your food. You are my slave now. “
Seraphina hissed, baring her fangs at the women. “Impossible! You are bound to me. You are my thrall.”
They two argued fiercely in the alleyway, neither willing to back down. Each convinced they were right, they had the ancient magical traditions that forged contracts bound by blood on their side. However, neither could deny the strange energy that flowed between them, pulsing with energy that they have not felt before.
After much shouting and magical posturing, Lysandra sighed and taken her phone from her pocket. “Clearly, this is beyond both of us. Let me call an expert in magical law. I know just the person. “
“Oh sure and fae lawyer, I so no bias here,” Seraphina hissed back at her.
Lysandra rolled her eyes and called the contact on her phone. “Hello Esmeralda, sorry to call you this hour of the night but I have an odd predicament. Could you help out?”
Seraphina’s eyes widened when she recognised the name of one of the top attorneys in the city. One who got a name for herself in the magical underground of this city as someone who was delicate and renowned for solving supernatural disputes. It made her agree to Lysandra’s offer to seek council for their problem.
The attorney’s office was small, tucked between an all-night café that was quite popular with vampires, and an apothecary that specialised in high end coffee beans in the front, and magical potions in the back. Esmeralda’s office was a quiet sanctuary amidst the chaos of the city. In this calm, Esmeralda listened carefully to their arguments.
Seraphina’s claim of thrall hood through the bite and Lysandra’s invocation of the ancient fae laws that demanded servitude from the vampire. When they finished, Esmeralda leaned back in her chair, considering both laws, her eyes going back and forth between the two.
Finally she spoke, looking at them with a bit of a devious, knowing smile. “Congratulations on your new marriage.”
Both women blinked, stunned for a moment into a silence they have not had since they met.
“What!?” they both exclaimed in unison, recoiling in shock.
Esmeralda leaned forwards to explain. “Seraphina, by biting Lysandra you have invoked a deep bond of servitude and you belong to her. Fae law binds those who consume Fae food, and in all intents of this law, you have feasted on Fae food, even if that food is a Fae.”
Lysandra gave a small “I told you so” look at Seraphina.
Esmeralda continued on. “And Lysandra, a vampire has bitten you. You are rightfully Seraphina’s thrall. Both of you are each-other’s master. The only implication of this means you are equal in the bounds of magical contracts. They are partners in an eternal union that can’t be broken. So you two are now married. Congratulations, you can’t divorce in this marriage.”
Seraphina and Lysandra stared at each other, the reality of their situation dawning like a rising sun. Lysandra was the first to speak finally, saying, “My husband is going to be so pissed.”