I'm not sure if there is a specific 'rin and shiemi pregnant fanfic' out there. There are countless fanfics on the internet, and it might be difficult to find one with this exact theme. You could try searching on popular fanfic websites like Archive of Our Own or FanFiction.net.
Since 'lemon' usually implies adult content, it might have inappropriate sexual descriptions involving Rin and Shiemi. But this kind of content is not in line with the original spirit of the work and is also not suitable for general audiences.
The plot could start with Rin and Shiemi getting married. Soon after, Shiemi becomes pregnant. As the pregnancy progresses, they might have to deal with the fear of the unknown. Maybe there are threats from the demon world because a child of Rin's could be very powerful. They would then have to protect Shiemi and the unborn baby while also preparing for the new life that is coming.
The theme of sacrifice also sometimes appears. They might be in a situation where one has to sacrifice something for the other's well - being or for the greater good. This could add a lot of drama and depth to their relationship. For example, Rin might be willing to sacrifice his position in the exorcist world to protect Shiemi from danger.
Another theme could be self - discovery. As they interact, both Yuri and Shiemi might learn more about themselves, their desires, and their identities. For example, they could discover new aspects of their personalities that they hadn't been aware of before.
One common theme is the exploration of their relationship's development. Since their characters have different natures in the original work, fanfics often focus on how they come to understand and care for each other.
A good fanfiction about their kiss should have strong character development. It should show how Rin and Shiemi have grown to reach this point in their relationship. For instance, if it shows how Rin has become more in control of his powers and more confident in his feelings for Shiemi, that would be great.
A lot of fanfics focus on the idea of Amaimon protecting Shiemi in some way. Given his power and her relative vulnerability in some aspects, this makes for an interesting plot. Also, there are fanfics that deal with the theme of self - discovery for both characters. As they interact more, they learn more about themselves, especially in relation to their feelings for each other. This can be really fascinating as it delves deeper into their personalities than the original work might have.
I really like the fanfic 'Rin and Shiemi: A New Chapter'. It starts off with them going on a mission together. In this story, they have to rely on each other more than ever. It has some really cute moments where Rin tries to protect Shiemi in his own clumsy way, and Shiemi in turn helps Rin understand his powers better.
Yes, there could be some. Some fanfiction writers might create stories about Rin and Shiemi in a relationship that leads to a family - friendly pregnancy scenario. For example, they could focus on the emotional journey of the two characters as they prepare for a new life together, like how they deal with the changes in their relationship, their hopes and fears for the future, and how their friends and family react. This type of fanfiction can be a creative exploration of the characters' development within the context of a relationship and impending parenthood.