Well, it could be a story about how Clarke and Raven's relationship has developed in an unexpected way. Maybe there was some sort of experiment gone wrong that led to Clarke's pregnancy. Or perhaps it's a more emotional plot where their friendship turns into something more complex due to the pregnancy situation.
One possible plot is that in a post - apocalyptic world (assuming it's in that kind of setting), they are forced to rely on each other more. There could be some strange event that makes Clarke pregnant. Raven, being the smart and resourceful one, tries to find a way to deal with the situation while also dealing with her own feelings towards Clarke. And Clarke is struggling with the physical and emotional changes of being pregnant in such a harsh world.
Maybe a plot where their relationship changes and develops because of the pregnancy. They could start off as just friends or comrades and then become closer as they navigate the pregnancy together. There could be a lot of emotional growth and self - discovery for both characters.
Perhaps the fanfiction could center around Clarke's search for a safe place to have the baby. In 4x13, the world is full of threats like radiation and warring factions. She may set out on a journey to find a place that can offer some semblance of safety for her unborn child. Along the way, she could encounter old friends and enemies, and they all play a role in either helping or hindering her quest for a safe haven.
The main characters are clearly Clarke and Raven. Clarke is the one who is pregnant, so she will likely be the focus in terms of her physical and emotional state throughout the story. Raven, on the other hand, is involved as she is somehow related to Clarke's pregnancy, either directly or indirectly.
The plot could involve Raven and Slade being forced into an uneasy alliance due to the pregnancy. Maybe there's a prophecy that their child will have great power, and different factions either want to protect or destroy the unborn baby. Raven struggles with her emotions, as she's not sure if she can trust Slade completely, but she knows she needs his help to keep the baby safe.
One plot twist could be that the pregnancy is actually a false alarm caused by some strange side - effect of the post - apocalyptic environment they are in. Clarke and Bellamy have already started making plans and getting excited, so this would be a huge letdown and cause some strain on their relationship.
A plot twist could be that the pregnancy is not what it seems. Maybe it's an illusion created by a villain to distract them from a bigger threat. Raven and Damian might initially believe it's real and start making all these plans, only to find out later that they've been tricked.
One great source could be Archive of Our Own (AO3). There are many talented writers who create Raven and Clarke pregnant fanfiction on that platform. Just search for 'raven and clarke pregnant' on AO3 and you'll find a variety of stories with different plotlines and writing styles.
In the fanfiction about raven and clarke's kiss, the setting could play an important role. It could be set in a post - apocalyptic world where they find a moment of peace and connection. Their kiss might symbolize hope and new beginnings in a world full of chaos. Also, the author might use different writing styles to describe the kiss, like a slow - motion - like detailed account or a more passionate and quick - paced description.
One possible theme could be new life and growth. Just as a raven is pregnant, it could symbolize the start of something new in the story's universe. Another theme might be protection, as the characters in the fanfiction could be tasked with protecting the pregnant raven.
Perhaps the story could focus on the father of the baby. If it was someone unexpected, it would create a lot of drama. For example, if it was a character who was previously an enemy. Clarke would then have to navigate not only her pregnancy but also the complex relationships that come with it. And she may have to face the judgment of the group she leads.