Their relationship can be shown as even more loving and protective. Superman would be constantly worried about Lois and the baby, and Lois would appreciate his care while also being her strong - willed self. For instance, he might fly her to her doctor's appointments super - fast to avoid traffic.
One popular 'Superman and Lois' fanfic could be the ones that explore their family life in more depth. For example, stories where they deal with their sons' superpowers growing and how they handle the challenges as a family.
One common theme is the struggle between Superman's dual identity. Lois has to deal with loving Clark Kent, the man, and Superman, the hero. Another theme is the danger Lois often gets into because of her closeness to Superman. Also, the idea of love conquering all, even the differences between a human and an alien from Krypton.
First, you should study the characters well. Know Superman's powers, his moral code, and Lois' personality, her determination as a journalist. Then, think of an interesting scenario. It could be something like what if Lois discovers a new power of Superman that he doesn't even know about.
One great fanfiction in this vein could be 'The Kryptonian Heir'. It beautifully explores how Superman deals with the impending fatherhood while still protecting Metropolis. It delves into his relationship with Lois during her pregnancy, showing their love and the challenges they face together.
One common theme is the relationship between Superman and Lois. Writers often explore how their love story unfolds and how they support each other. Another theme is Superman's identity and how Lois helps him keep it a secret or deal with the consequences if it's revealed.
One great 'Superman x Lois Lane fanfic' is 'The Daily Planet Diaries'. It delves deep into their relationship within the walls of the Daily Planet. Another one is 'Metropolis Love Story' which focuses on their more private moments and how Superman's identity affects their love. There's also 'Love in the Sky' that shows their relationship from a unique, action - filled perspective.
One idea could be that Superman has to balance his superhero duties while also being extra protective of Lois during her pregnancy. He might use his powers in new and creative ways to ensure her safety and comfort. For example, he could create a special force field around her when she's out in public.