Okay, I've read some Kirk/Spock stories that are based on fairy tales like Cinderella and Beauty & the Beast. So why not another fairy tale, a darker one?
"Thousandfurs" or "All-Kinds-Of-Fur" is about the sin of inappropriate love or incestuous love. I'll give a summary here but you should look it up and read the whole tale.
Once upon a time there was a king, who had a wife with golden hair, and she was so beautiful that her equal was not to be found anywhere on earth. She fell ill and before she died, she made the king promise not marry anyone who is not as beautiful as she is and who does not have the same golden hair as her. After her death, he grieved a long time. But then the councilors insisted he remarry for they needed a queen. Messengers looked far and wide but could not find a princess who met both criteria.
So the years passed. But the king had a daughter. After she came of age, he looked upon her and realized she was as beautiful as her mother, with the same golden hair. He fell in love and announced he would marry her. The king's councilors and his daughter are horrified. The princess, hoping to stall until he comes to his senses, demands impossible bride gifts: three dresses: one as golden as the sun, one as silver as the moon, and one that glistens like the stars. Lastly, a cloak put together from a thousand kinds of pelts and fur. Every animal in the kingdom must contribute a piece of its skin for it.
The king was determined though. He hired the most skilled maidens in the kingdom to weave the dresses. And had his huntsmen capture all the animals in his entire kingdom and take a piece of skin from each one. From these a cloak of a thousand kinds of fur was made. Quicker than anyone thought, everything was done. The king presented these gifts to his daughter and announced that tomorrow would be their wedding day. The princess decided her only choice was to run away. She packed up the dresses, three golden valuables, put on the fur cloak, blackened her hands and face with soot before leaving the castle.
The princess walked all night til came to a forest and then she slept. The next day, she was found by the prince of the neighboring kingdom and his huntsmen and dogs. She claimed to be a poor girl abandoned by her mother and father and begged for pity. The king agreed to grant her work in the castle kitchens. Because she gave no name, they called her "All-Kinds-Of-Fur".
When the prince held a ball, the princess sneaked out and went to it in her golden dress, and the prince fell in love with her. The next morning, the cook set her to make bread soup for the prince, and she put her golden ring in it. The prince found it and questioned the cook and then All-Kinds-of-Fur, but she revealed nothing. The next ball, she went dressed in her silver dress and put the golden spindle in the soup, and the prince again could discover nothing.
The third ball, the princess went in the dress of stars, and the prince slipped a golden ring on her finger without her noticing it and ordered that the last dance go longer than usual. She was not able to get away in time to change; she was able only to throw her fur mantle over her clothing before she had to cook the soup. She slipped the last valuable, a golden reel, into the soup. When the prince questioned her, he caught her hand, seeing the ring, and when she tried to pull it away, her mantle slipped, revealing the golden dress. The prince pulled off the mantle, revealing her, and they married. They lived happily until they died.
What I am asking for follows more closely to Robin Mckinley's novel Deerskin, which is based on Donkeyskin, a variation of Thousandfurs. In her novel, the princess was a lonely child who had been neglected by her parents, the most splendid people in all seven kingdoms. They were known as the most handsome king and the most beautiful queen. The princess' only friend is her pet dog. The queen falls ill and starts to lose her beauty. This causes her to lose her will to live, because she wants to be remembered as the most beautiful person, and nothing less. Years after the queen's death, the king declares his wish to marry his daughter. Horrified, she refuses and then locks herself in her room. After a few days of trying to court her with extravagant gifts, the king breaks into her room and rapes her. Then she runs away. I won't tell the rest, in case you want to read the book. It's very good. Plus I want you guys to come up with your own ending.
I would really, really appreciate the story being written futuristically. George and Winona of the House of Kirk are the king and queen of Earth with their son Jim as the prince, who they neglect to continue their extravagant and carefree lives. (It is up to you whether to include Jim's brother Sam.) At some point George dies and Winona grieves for a long time. She is pressured to consider remarrying but does not think anyone measures up to her deceased husband. Then at Jim's coming out ball, Winona notices that Jim is all grown up and looks a lot like his father, with the same legendary blue eyes and golden brown hair. Winona announces she will marry her own son, taking advantage of an old forgotten law that permits the royal family, to marry within the family, to keep the blood pure, if no eligible noble person is found worthy.
Jim is horrified and refuses. It is up to you to decide to use a variation of the impossible gifts. But I want to include Winona raping her son, using a drug to incapacitate him. He runs away, cuts off his hair, maybe dyes it, obtains contacts to make his blue eyes hazel, and manages to stow away on a transport to the planet Vulcan, where Sarek and Amanda of the House of Surak are king and queen, and their son Spock is the handsome prince. (It is up to you whether to include Spock's brother Sybok.)
Jim befriends Scotty, who helps him obtain fake identification, and get a job at the palace. Eventually he befriends Dr. McCoy, Chekov, Sulu, Uhura, Gaila, and Pike. Maybe include some canon and original Vulcan characters. Of course, he will meet Spock and fall in love. But Jim feels guilty for the lying about his real identity, and suffers from insecurities from his childhood and the rape. From there the story is mostly up to you and what you want to use from the traditional fairy tale format.
Bonus:Winona finds out Jim's location and threatens war if Sarek does not return him. Jim tries to be noble to protect his and Spock's people by handing himself over. Spock refuses to give Jim up because he loves him.
Bonus: Sarek figures out before anyone else who Jim is and secretly draws up documents granting him asylum. He has backing from other allied planets who consider Winona a tyrant who is unfit to rule.
Bonus: At the end of the story, Jim and Spock either rule Earth or they rule Vulcan but not both. You can also decide on neither. That's where either a sibling or a cousin comes in as alternative heirs to the throne.
Bonus: BottomKirk, TopSpock
, Works in Progress Characters: Sarek