One idea could be focusing on how they prepare for the baby's arrival in secret. Anakin might be building a small crib with his mechanical skills while Padme is knitting baby clothes. Another could be their concerns about the baby's future in a galaxy filled with conflict.
One plot idea could be Ahsoka discovers Anakin's relationship with Padme and has to keep it a secret while also trying to protect them from the Jedi Council's potential discovery. Another could be a story set during a dangerous mission where Anakin and Padme are in peril, and Ahsoka must use her skills to rescue them. A third idea is a fanfic that explores how Ahsoka's presence in Anakin's life affects his relationship with Padme, whether it brings them closer or causes some unforeseen tensions.
One idea could be a time - travel plot where Luke and Leia are sent back in time and meet their parents, Anakin and Padme, before Anakin's fall to the dark side. They try to prevent the events that led to the rise of the Empire.
A possible plot is that they go into hiding together. They find a remote planet where they think no one can find them. However, they soon realize that the dark side is still lurking. Maybe Palpatine somehow discovers their location and sends his minions to either bring Anakin back to the dark side or eliminate them. This would create a lot of tension and action in the fanfiction. Also, the story could show how their love for each other and their unborn child gives them the strength to fight back.
A really interesting plot might be about how they deal with Anakin's premonitions of losing Padme. In the fanfiction, they could work together to try and change the future he foresees, perhaps seeking out ancient Jedi or Sith knowledge to find a way.
One plot idea could be Anakin and Padme having to work together secretly during a Clone Wars mission. Maybe they are on a planet where they need to negotiate with a local leader who is sympathetic to the Separatists. Anakin has to use his Jedi skills and Padme her diplomatic skills to turn the situation around.
One interesting plot point could be how they navigate their relationship in secret. Since Anakin is a Jedi and Padme is a senator, their relationship is against the Jedi Code. Fanfics might explore how they keep it hidden from others, like sneaking around to meet.
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.
Anakin and Padme could go on a secret mission together during the Clone Wars. They'd have to hide their relationship while facing all kinds of dangerous enemies and situations. It would be exciting to see how they use their respective skills, Anakin's Jedi powers and Padme's political acumen, to get out of trouble.
One idea could be their first secret meeting on Naboo. Young Anakin is still a bit naive but full of passion, and Padme is intrigued by his unique charm. They could explore the beautiful landscapes of Naboo together while sharing their dreams and fears.
One interesting plot point could be the reactions of their friends and allies. Obi - Wan, for instance, might suspect something but choose to keep it to himself. Another is how the Sith might try to use Padme's pregnancy as a way to manipulate Anakin further. They could plant false rumors or try to target Padme to get to Anakin.