He might also become more patient. Usually a bit hot - headed, but with Kagome pregnant, he'd have to learn to be more calm and understanding. For example, when Kagome has mood swings due to hormonal changes, Inuyasha would have to control his temper and be more supportive instead of getting frustrated.
The relationship would likely become more intense. They would have to rely on each other more, and their bond would deepen as they are about to become parents. Inuyasha would probably become more protective of Kagome.
One possible plotline could be Kagome and Inuyasha preparing for the arrival of their baby. They might face challenges like finding a safe place to live in the feudal era. Inuyasha would be extra protective, using his demon strength to keep Kagome and the unborn child safe from any threats, be it other demons or the perils of the wild.
Inuyasha would likely become more protective. He's always been protective of Kagome, but with her pregnant, it would be on a whole new level. He might not let her go on dangerous missions as easily. Kagome, on the other hand, would probably get frustrated with his over - protectiveness at times, but also appreciate his concern deep down.
Perhaps the plot could involve the initial shock and confusion for both Kagome and Sesshomaru. They'd have to deal with the social and personal implications of this unexpected situation. Maybe they'd try to keep it a secret at first, but as the pregnancy progresses, it becomes harder to hide.
There might be some out there. You could try searching on fanfiction - specific websites like Archive of Our Own. Just type in the relevant keywords and see what pops up. However, this is a rather unusual and creative concept for a fanfiction.
Well, perhaps in the fanfic, the pregnancy could be a catalyst for Inuyasha and Kagome to bring their two worlds closer. They could start to work on making a place where their child can grow up safely, which means mending relations between demons and humans in their area. And of course, there would be the whole aspect of Kagome's pregnancy journey, like her changing emotions and physical needs.
There could be a fanfic that delves into their backstories more. For instance, exploring Sango's past as a demon slayer in greater detail. How she overcame her family's tragedies and how that has shaped her. Inuyasha and Kagome could be part of this exploration, learning more about Sango and in turn, Sango learning more about their own complex pasts and how they are dealing with it.
One common theme is their relationship development. Writers often focus on how Inuyasha and Kagome overcome their differences and grow closer. Another theme is adventure. Since the original series was full of it, fanfics continue with new quests and battles.
One common plotline could be Kagome and Inuyasha preparing for the arrival of their baby in the feudal era. They might face challenges like getting the necessary supplies and dealing with the reactions of their friends and foes. Another plotline could involve Kagome's pregnancy being a symbol of hope for the future, uniting different clans. For example, some clans that were previously at odds might come together to protect Kagome and the unborn child, seeing it as a new beginning for the land.