Yes, there might be. Some fanfics in the Star Wars fandom explore the complex relationship between Anakin and Obi - Wan in non - violent or alternate - universe scenarios that are family - friendly.
You could try Archive of Our Own (AO3). It has a vast collection of Star Wars fanfics, and you might be able to find one with a unique take on the Anakin - Obi - Wan murder concept there.
There's the theme of trust. In a lot of Anakin and Obi - Wan fanfic, their trust in each other is either strengthened or tested. Another theme is the idea of destiny. How Anakin's destiny as the Chosen One and Obi - Wan's role in it are explored. And the theme of sacrifice. Fanfics might show how they are willing to sacrifice for each other, which is a big part of their relationship.
Another theme is loyalty. They are master and apprentice, and their loyalty to each other is often tested. In some fanfics, they face situations where they have to choose between their loyalty to the Jedi Order and to each other. This can lead to some really intense storylines.
One common theme is betrayal. Anakin's actions, often related to his turn to the dark side, are seen as a betrayal of Obi - Wan's trust. This creates a deep sense of hurt in Obi - Wan.
A typical 'obi wan anakin fanfic' often has their strong bond as a key element. It shows how they rely on each other in battles and in the Jedi Order. Another element is their different personalities. Obi - Wan's calmness contrasting with Anakin's impulsiveness.
The theme of friendship and love is also prevalent. It's not always romantic love, but a deep, abiding love that encompasses friendship, respect, and a connection that is unique to them. These fanfics explore how this love can withstand the trials and tribulations that come their way, whether it's battles, political intrigue, or Anakin's inner demons.
To develop Anakin's character, start with his disillusionment with the Jedi. He believes they have failed him, so his turn to the dark side seems like a way to gain the power he thinks he needs. In the Mustafar part of the fanfic, he can be shown as more impulsive and less in control of his emotions. Obi - Wan, on the other hand, can be developed as a character who is still holding onto hope that Anakin can be redeemed, but is also ready to do what is necessary to protect the galaxy.
The theme of friendship also runs through many of these fanfics. Their friendship is a central part of their relationship. Fanfics might show them having heart - to - heart talks, sharing secrets, or just having a good laugh together, which makes their relationship more complex and interesting.
In many fanfictions, Obi - Wan might use his deep knowledge of the Force. He could reach out to Anakin through a Force - bond, calming his inner turmoil and guiding him away from the dark side. For example, he might remind Anakin of their past together, their training, and the values they once held dear.