One storyline could be that they receive a prophecy during Sharon's pregnancy that their child will have some sort of special power. This leads them on a journey to find out more about it and protect their unborn baby from those who might want to use the baby's power for evil. Along the way, they meet other characters from the Marvel universe who either help or hinder them.
One idea could be that they have to protect their baby from an old enemy who resurfaces. Maybe the baby has some special abilities that the enemy wants to use for their own evil plans.
In a fanfiction, the baby could be a symbol of their future together. It might make them more committed to each other, as they both love the baby deeply. They would have to work together more closely, sharing parenting duties, which could lead to a more equal and loving relationship. Steve might learn to be more flexible in his views from Sharon, and Sharon might become more confident in their relationship because of Steve's unwavering support in their new family life.
One popular storyline could be them dealing with the challenges of pregnancy during a time of war or superhero duties. Maybe Steve is worried about protecting Peggy and their unborn child from his enemies.
One way to write it creatively could be to explore the challenges they face. For example, in a world where superheroes' personal lives are constantly under public scrutiny, their pregnancy would be no exception. They might have to deal with the media frenzy, concerns from their superhero friends about how it will affect their ability to fight crime, and their own insecurities about raising a child in such a dangerous world. Another aspect could be to show how their relationship deepens during this time, as they prepare for the arrival of a new life together.
One great Steve Rogers and Peggy Carter fanfic is 'A Time Remembered'. It beautifully captures their relationship with well - written dialogues and a heart - warming plot. Another is 'Love Beyond Time' which delves deep into the emotions they might have had for each other. It shows Peggy's strength and Steve's unwavering loyalty in a very engaging way.
Another common plot is a time - travel related one where the OC and Steve Rogers are sent back in time together. This could lead to all sorts of adventures, like them having to blend in with the past while also trying to figure out how to get back to their own time. Maybe the OC has some knowledge of history that helps Steve, who is already familiar with the past, in a new way.
A possible storyline is Sharon Carter getting involved in a time - travel adventure similar to what Steve Rogers had. She might end up in a different era and has to use her skills and wits to survive and find her way back. Along the way, she could discover new things about Captain America's past that were previously unknown. Or perhaps a story where she teams up with other superheroes to take on a new threat, but she's constantly haunted by her relationship with Captain America and how it affects her actions in the team.
Another storyline might involve Sharon Carter getting kidnapped and Captain America having to rescue her. This would not only show his heroism but also his deep feelings for her. Along the way, he might have to fight his way through hordes of bad guys and overcome various obstacles.
One interesting storyline could be Darcy and Steve teaming up for a secret mission. Steve's combat skills and leadership combined with Darcy's scientific knowledge could make for an exciting adventure. Maybe they have to stop a villain who is using some sort of advanced technology that only Darcy can understand.
A really interesting storyline could revolve around Steve Rogers' pregnancy in an alternate universe. Maybe in this universe, male pregnancy is more common among enhanced individuals. He could be part of a community of male parents - to - be. His pregnancy might also bring out a more nurturing side of him that we haven't seen before. He could start mentoring other expectant fathers, all while still having to deal with the threats that come with being Captain America.