Sesshomaru would be very much in control of his emotions on the surface. But deep down, he'd be worried about how this would affect his status among the demons. He might start to question his own identity and what it means to be a demon in this new situation. His reaction would be slow - evolving as he tries to understand the implications. Inuyasha would initially be in disbelief, but as he starts to feel the baby move or experience other symptoms, he'd have a complete change of heart. He'd become more responsible and start thinking about how to provide a better future for the child. He might also have to deal with his own insecurities about being a good father, given his own troubled past.
It would completely disrupt the existing power balance. Their relationship would shift from one of rivalry to something extremely complex. It could also change how other characters interact with them, as this new situation would be so out of the ordinary.
Some characters might be shocked. For instance, Inuyasha could be initially stunned by the news, given his relationship with Sesshomaru. He might be conflicted between his dislike for Sesshomaru and his sense of what's right for Rin.
First, you need to understand the characters well. Sesshomaru is a complex character, so study his personality traits from the original series. For the OC, give her a distinct personality and backstory. For example, if she's a healer, explain how she got those skills.
The other characters' reactions would vary. Her family in her world would likely be worried and protective. In the feudal - era world, the villagers might be superstitious about the situation. They could either shun Kagome or see her as a powerful figure because of the baby's potential. Some of Sesshomaru's followers might be angry at him for leaving and feel a sense of duty to protect Kagome and the baby. And other demons might be curious about the half - human, half - demon baby that is to be born.
Sesshomaru would raise the baby with a combination of discipline and protection. He would protect the baby from any threats, using his powerful abilities. At the same time, he would discipline the baby when it made mistakes, teaching it the ways of the demon world. Inuyasha, on the other hand, would add a more carefree and emotional touch to the parenting, creating a balance in the baby's upbringing.
In fanfiction, many things are possible outside the normal canon of the Inuyasha universe. It could be that a creative writer has imagined a scenario where Kagome and Sesshomaru have a relationship that leads to pregnancy. Maybe there's some magic or a unique plot device that brings them together in this unexpected way.
You can also build a plot around her relationship with Sesshomaru. Maybe there is a rift between them that needs to be healed. She tries to do something to regain his trust or respect, but things keep going wrong. This internal family drama can be intertwined with external threats like demon battles.
One idea could be a story where a powerful magic affects both Sesshomaru and Inuyasha, causing them to be in a situation where they have to deal with the unexpected pregnancies. This could lead to them having to put aside their differences and work together to understand what's happening to them. Maybe they go on a journey to find a cure or a way to handle the situation, all while facing various challenges from other demons who see their condition as a sign of weakness.
Well, in the vast world of fanfiction, there are all kinds of wild and creative ideas. But in the context of the Inuyasha canon, this is really out of the ordinary. Sesshomaru and Inuyasha have a long - standing enmity and different personalities. Their relationship is mainly centered around power struggles and family issues rather than this kind of very unorthodox situation.
When writing a sesshomaru and inuyasha mate fanfiction, think about the world they live in. Incorporate the demon hierarchy, different demon clans, and the rules that govern their society. This will add depth to your story. Also, explore their emotions in a new light. Since they are mates, how do their feelings change their usual behavior towards each other? For instance, Sesshomaru may show a softer side that was previously hidden.