Well, a usual theme is the struggle. In mpreg painful birth fanfiction, the struggle of the character to come to terms with the unexpected pregnancy is common. And then there's the pain aspect during birth which is often described in detail, showing the character's endurance. Plus, the theme of new beginnings after the birth can also be seen, as the character embarks on a new chapter of life with a new family member.
One common theme could be the struggle for survival, both for the mother and the baby. Another might be the transformation of the character going through the birth, becoming stronger or more vulnerable in different ways.
One common theme is the exploration of the characters' relationships in a very different context. For example, how the other Avengers react to the pregnancy situation. Another theme could be the challenges the pregnant character faces, like still being part of the superhero team while dealing with the physical and emotional aspects of pregnancy.
One common theme could be the exploration of new relationships. For example, how Spider - Man's relationships with other characters change when he is in a situation of male pregnancy. Another theme might be the struggle with his superhero identity. He has to balance being a superhero and dealing with the physical and emotional changes of pregnancy. Also, the theme of support from his friends and family (or lack thereof) could be explored.
One common theme is the struggle against vampire nature. Since vampires are often seen as not being able to reproduce in the traditional sense, the mpreg goes against this norm, leading to internal and external conflicts.
One common theme is the exploration of the character's reactions to the unexpected pregnancy. How they deal with the physical and emotional changes is often explored.
First, do research on pregnancy and birth processes to make it realistic. Then, focus on character development. Make the character's emotions and reactions believable. Also, describe the pain in a vivid but not overly graphic way. Build up the tension before the birth to engage the readers.
In tony stark mpreg birth fanfiction, a frequent theme is the adaptation to the new situation. Tony, being a genius and used to being in control, now has to deal with a body that is going through something completely out of his expertise. Also, the theme of protection often comes up, both him protecting the unborn and others protecting him.
In Severus Snape mpreg birth fanfiction, a recurring theme is the exploration of relationships. His relationship with the other characters, such as his friends or former enemies, may change. For instance, some might be more sympathetic than he expected, while others might shun him. Additionally, the theme of motherly/fatherly instincts in Snape is often explored, as he has to adapt to a role that is very different from his usual self.
One common theme is the exploration of new family dynamics. With Percy Jackson being male and experiencing pregnancy, it challenges the traditional concept of family. Another theme could be the reaction of his friends and the demigod community. Some stories might focus on how they support or struggle to accept this new situation. Also, the physical and emotional journey of Percy during the pregnancy is often a theme. Writers might describe his fears, joys, and the changes he goes through.
One common theme could be the exploration of new relationships. For example, how the characters around the pregnant one react and support. Another theme might be the challenges faced during the pregnancy in the Inuyasha universe, like dealing with demons or magic while being pregnant. Also, there could be themes related to the future of the child and how it will fit into the existing world of Inuyasha.