Koga's wolf pack would likely be very protective of the baby. They would see it as the future of their pack, especially if the baby shows signs of wolf - like abilities. As for Kagome's friends in the feudal era, Sango and Miroku would probably offer their support and wisdom. Sango, having experience with family, could give Kagome advice on raising a child in such a complex world. Miroku might be more interested in the potential spiritual powers the baby could possess and how it could be used for good.
Kagome's friends from her village might be initially shocked. They know Kagome has been involved with the demon world, but having a baby with a wolf demon like Koga is a whole new level. However, some of her closer friends might eventually come around and support her. Inuyasha, on the other hand, would probably be a bit jealous at first but might also see the potential in the baby for good in the fight against evil.
The reactions would be mixed. Some of Kagome's more traditional friends in her own time might be horrified and try to keep her away from the baby. But in the feudal era, Kagome's friends who have seen the good in demons like Shippo might be excited. Shippo could see the baby as a new playmate and someone to grow up with. And Koga's demon allies might view the baby as a powerful asset in the ongoing power struggles between different demon clans, which could bring both benefits and dangers to Kagome and Koga as they try to raise their child.
At first, Kagome is likely to be angry. She's a strong - willed character, so being kidnapped goes against her nature. She would probably struggle and try to escape immediately, yelling at Koga about how wrong his actions are.
One common theme could be family. Since it involves a baby, it might explore how Koga and Kagome adapt to being parents and creating a family unit.
With a baby in the story, their relationship could become more solid. The shared responsibility of taking care of the baby might make them realize how much they rely on each other. For example, Koga could use his speed and strength to protect the baby from physical threats, while Kagome could use her knowledge and healing abilities. This mutual dependence could deepen their love for each other.
Inuyasha would probably be very angry at first. He has always had a possessive streak when it comes to Kagome. He might see Koga as a rival and try to fight him. But as time goes on, he could start to realize that Kagome is happy with Koga and, though it would be difficult for him, he might eventually back off and respect her choice.
One plot idea could be that Koga and Kagome accidentally end up in a situation where they have to take care of a baby together. Maybe they find the baby in the forest and have to figure out how to keep it safe while also dealing with their own feelings for each other. Another idea is that a magic spell causes them to have a baby of their own in a strange, otherworldly way. This would lead to a whole new set of challenges as they navigate being new parents in a world full of demons and magic.
The story could be full of challenges. Koga, being a wolf demon, and Kagome, a human with spiritual powers, would face many difficulties in raising their baby. Maybe the baby would inherit unique powers from both parents, leading to some interesting adventures as they try to protect the baby from those who might want to use its powers for evil.
I'm not sure of specific 'koga kagome baby fanfiction' stories off - hand. You could try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in the relevant keywords and see what comes up.
One possibility could be a story full of drama. Maybe Kagome initially struggles with the idea of having a child with Koga. She might worry about how her friends, especially Inuyasha, will react. But as time goes on, Koga shows his unwavering support and love for her. He vows to protect their family at all costs. And together, they start to build a new life, away from the chaos of their previous adventures, focusing on the future of their unborn child.
Another theme is adventure. Given that they are both part of a world full of demons and magic, fanfictions often send them on exciting quests together. For example, they might go on a journey to find a powerful artifact or to defeat a new evil that has emerged. This not only tests their relationship but also shows their individual strengths.
Shippo would be excited. He would be like a little helper, running errands for Miroku and Kagome. He might also be curious about the new baby and constantly ask questions about when it will be born and what it can do.