Perhaps in the fanfiction, Inuyasha's full - demon form makes him lose his memories. Kagome has to make him fall in love with her all over again while also trying to restore his memories. This would be a more emotional and character - driven plot, exploring their relationship on a deeper level.
Another idea is that Inuyasha's full - demon form attracts the attention of an ancient and evil force. This force wants to use Inuyasha for its own dark purposes. Kagome has to fight against this force, not only to protect Inuyasha but also to save the world. It would involve a lot of action and some difficult decisions for Kagome.
One possible fanfiction could be about Inuyasha in his full demon form and Kagome's journey to understand and reach out to him. Maybe she uses her spiritual powers to calm him down when he's on the verge of losing control. It could explore their relationship dynamic in this unique state of Inuyasha.
One idea could be the challenges they face in protecting their unborn child from the various demons that still lurk. Another could be how their relationship evolves during the pregnancy, with Inuyasha becoming even more protective. Maybe Kagome has to deal with newfound powers or sensitivities related to the pregnancy.
One plot idea could be Inuyasha and Kagome getting lost in a mysterious forest together. As they try to find their way out, they have to rely on each other more than ever, which deepens their puppy - love. Another could be a situation where they have to take care of a small, magical creature. This shared responsibility brings them closer. Maybe there's a time - traveling incident that separates them from their friends and they have to survive alone in a strange era, which makes their bond stronger.
One plot idea could be that Inuyasha and Kagome are paired up for a college project. They start off bickering like in the original series but gradually grow closer as they work together. They could discover a hidden mystery on campus that relates to their past lives.
Well, perhaps Inuyasha is under some sort of dark spell. He might be influenced by an evil force that makes him see Kagome as a threat to his freedom or something he needs to control. So, he kidnaps her and takes her to a remote place. Kagome, being the strong - willed character she is, tries to reason with him and break the spell's hold on him.
Their different backgrounds make them an interesting pair. Inuyasha is a half - demon from a feudal era, while Kagome is a modern - day girl. This contrast allows for a lot of creative exploration in fanfiction. Writers can play with how they interact, with Kagome introducing modern concepts to Inuyasha and Inuyasha showing Kagome the ways of his world.
One idea could be that Kagome discovers she's pregnant during a time of relative peace in the feudal era. This causes a stir among their friends and allies. Some might be overjoyed, while others worry about the implications. For example, Sango could be excited and offer her support, but Miroku might worry about the safety of the baby considering the many dangers in their world. Another plot could involve Inuyasha being overly protective, which causes some friction between him and Kagome as she still wants to be independent.
Another fanfiction concept could be set in an alternate universe where they are all students in a school. Inuyasha might be the troublemaker, Kagome the studious one, and Sesshomaru the aloof and brilliant student. There could be a mystery at the school that they have to solve together, and through this, they form an unlikely friendship.
One plot idea could be that they have to save a village from a mysterious curse. Inuyasha uses his combat skills and Kagome uses her knowledge of the spiritual world to find a solution. Another idea is that they get separated in a strange new land and have to find their way back to each other while facing various obstacles alone.
Maybe a plot where Inuyasha and Kagome accidentally swap bodies. This would lead to some really funny and also some very touching moments. Inuyasha in Kagome's body would start to understand her better, like how she has to deal with the pressure of her family and school. And Kagome in Inuyasha's body would see how lonely he has been and how much he actually cares for her.