Well, in some fanfictions, there might be a situation where Obi - Wan and Padmé's father are born under similar circumstances. For example, they could both be born during a time of great upheaval in the galaxy. This similarity in their birth times could be used by the fanfiction writer to create a connection between them later in life. Or perhaps Padmé's father was born with some special ability that Obi - Wan later discovers and it becomes a crucial part of the story.
In most Star Wars canon, there's no relation between Obi - Wan and Padmé's father. However, in fanfiction, the possibilities are endless. Some fanfics might create a connection for the sake of a more complex plot. Maybe Obi - Wan could be involved in some secret mission related to Padmé's family before her birth, which could be construed as a form of connection to her father.
One possible theme could be forbidden love. Since Obi - Wan is a Jedi and Padmé is a senator, their relationship would be against the Jedi Code. Another theme might be sacrifice. Maybe the kiss is a final goodbye before one of them has to make a great sacrifice for the greater good of the galaxy.
In the fanfiction, it might be that Anakin has been poisoned. As the poison takes effect, he collapses into Obi - Wan's arms. Or perhaps Anakin has just learned some devastating truth about his past or the Jedi Order that shocks him to the point of physical collapse.
Some fanfictions might explore a situation where Anakin is being manipulated by a powerful dark force or a Sith Lord. This dark influence makes him see Obi - Wan as a threat to a grander plan. So, he kills Obi - Wan as part of this dark scheme, not fully in control of his own actions. And this can lead to a lot of complex emotions and plot developments later in the story, like Anakin's further descent into darkness and how the other characters react to Obi - Wan's death.
Sure, there are probably some fanfictions with that plot. In fanfiction, authors often like to explore relationships that were not fully developed or were only hinted at in the original source material. The kiss between Obi - Wan and Padmé could be part of a more complex story, maybe set during a time of great turmoil in the Star Wars galaxy. It could be a moment of passion, or a strategic move within the context of a much larger political or personal drama in the story.
One popular 'Obi - Wan and Padmé love' fanfiction is 'A Jedi's Heart'. It delves into the complex relationship between them, exploring how their feelings might develop within the context of the Star Wars universe. The story has some really interesting plot twists that keep readers engaged.
In fanfiction, there's no set rule. It's a realm of creativity. There could be a fanfiction where Obi - Wan is related to Padme's father through a prophecy or a magical force - related event. Or perhaps in a parallel universe - type fanfiction, their relation is part of a major plot twist. So, simply put, it's possible in the wild world of fanfiction.
Some fanfictions might have a plot where Padme's father was involved in a past event that Obi - Wan is now investigating. As Obi - Wan delves deeper, he realizes there are more connections between them than he thought. For example, Padme's father might have been a key figure in a war that Obi - Wan is now trying to understand better, and this connection could change the way Obi - Wan views Padme and his role in her life.
People write these fanfictions because they see potential in the relationship between Obi - Wan and Padmé. In the Star Wars movies, there are some moments and interactions that could be interpreted as having a deeper connection, and fans want to explore that further.
A plotline could involve them trying to keep the pregnancy a secret from certain parties. Maybe they fear the political implications or the reaction of the Jedi Council. As the pregnancy progresses, they have to face various challenges, like threats from enemies who might see the unborn child as a tool or a target. They then have to find ways to protect their family while still maintaining their public personas.