Often, this type of fanfiction delves into the psychological aspects of both characters. Padme's reaction could range from shock to trying to save Anakin from himself. It might also explore themes of redemption, as Anakin may later realize his mistake and seek to make amends, creating a more complex and engaging narrative than the straightforward love story in the movies.
One possible reason for such a plot in fanfiction could be to explore the darker side of Anakin's character. His fall to the Dark Side in the official Star Wars lore was gradual, and in fanfiction, this could be an extreme manifestation of that. Maybe it shows how the power of the Dark Side can corrupt relationships as well.
In some fanfictions, Anakin might hurt Padme out of misdirected anger or because he's being manipulated by the Dark Side. This can add a tragic element to their relationship, which was already complex in the original movies. It can also be a way for writers to show the consequences of Anakin's choices on those he loves most.
One possible plot twist could be that they are caught by Obi - Wan. Instead of reporting them immediately, Obi - Wan decides to help them cover up their relationship for a while. He realizes that their love is genuine and that Anakin's emotions are a powerful force that could be harnessed for good if managed properly. This would add a new layer of complexity to their relationships within the Jedi Order.
Well, in this fanfiction, Anakin could be written as having a stronger moral compass. Maybe he has some kind of epiphany early on about the true nature of the dark side and how it would ultimately lead to him hurting Padme. So he resists the temptations and devotes himself to protecting her. He could train harder in the light side of the Force to gain the power to safeguard Padme at all times.
One possible reason for such a fanfiction could be to explore the extreme psychological state of Draco. Maybe in this fanfic, Draco is pushed to the edge by his father's overbearing nature and the dark deeds of the Malfoy family. It could be a way to show his struggle for freedom from his family's dark legacy.
One idea could be that Anakin's fall to the Dark Side causes him to try and make Padme a Sith as well. He might use his newfound power to manipulate her, believing that together they could rule the galaxy. For example, he could start by isolating her from her friends and allies in the Jedi Order and the Republic, making her more dependent on him.
In some fanfiction set in a more peaceful time, they might interact with a lot of tender moments. They could have picnics and long walks, just enjoying each other's company and having deep conversations about their future.
A great fanfiction idea could be that Dark Anakin kidnaps Padme (not in a malicious way, but more out of his distorted sense of protecting her). He takes her to a remote planet where they are forced to confront their feelings for each other without the interference of the Jedi or the Senate. This would be a very intense and emotional story.
Their relationship becomes more possessive. In the Dark Side, Anakin's love for Padme could turn into an obsessive need to control her. He might see her as his possession rather than an equal partner.
Obi - Wan Kenobi would be one. He's Anakin's master, and in the fanfiction, he might suspect something about their relationship and have to decide whether to support them or uphold the Jedi Code.
Perhaps in the fanfic, Anakin has already fully embraced the dark side when Padme arrives on Mustafar. He shows her his new powers, thinking she will be impressed. But Padme is horrified. She tries to use their bond to reach the old Anakin inside. Meanwhile, the volcanic landscape of Mustafar could add a sense of danger and doom to their encounter, as if the planet itself is a symbol of their relationship falling apart.
One possible fanfic could be about Anakin and Padme's final encounter on Mustafar. It might explore Padme's desperate attempt to bring Anakin back from the dark side. She could be pleading with him, reminding him of their love and the life they could have had together. The scenery on Mustafar, with its flowing lava and harsh environment, would add to the intensity of the moment.