One way could be through self - sacrifice. If Inuyasha were to put himself in great danger to save Kagome from an even greater threat, it would show his true feelings for her. He could also openly admit his mistakes and beg for forgiveness, vowing to never let his past feelings for Kikyo cloud his judgment again.
One possible reason could be a misunderstanding. Maybe Kikyo was in some kind of danger and Inuyasha's actions to save her were misconstrued as betrayal. Another reason might be that Inuyasha was influenced by some external dark magic that clouded his mind and made him act against his normal feelings for Kagome.
I recommend the following Doujin novels to you, I hope you like them:
1. "Half-demon I rushed to the Soul World with broken iron teeth", a story that traveled through the world of Inuyasha and Death. In order to protect Kagome, the protagonist, Makoto Hojo, turned into a half-demon to fight against the powerful Void.
2. "Inuyasha: The Age of Chiyuki". The story was about a young man who had lost his life and returned to the Warring States Period. It became a derivative doujinshi novel of Inuyasha.
3. "I, Inuyasha!" The protagonist who had transmigrated into Inuyasha didn't have broken teeth. When he woke up, he found that he had become the city lord. The general Yue Huangquan and the divine spring Yunya, who were in love with the monster, also appeared.
The above is my recommendation. I hope you like it. Muah ~
Some great Inuyasha and Kagome fanfictions include those that focus on their adventures after the end of the series. For example, 'A New Beginning' which shows them building their life together in the feudal era. It has really good character development and stays true to their personalities.
One interpretation could be a reconciliation. Since they are often at odds in the original story, a kiss could symbolize the end of their feud and the beginning of a new relationship, whether it's a friendship or something more complex. It could be seen as a way to heal the rift between them.
Another theme is self - discovery. As they interact more closely in fanfictions, both kikyo and kagome often learn more about themselves. They might discover new aspects of their powers or their personalities through their relationship with each other.
One common theme is the exploration of their complex relationship. Given their history in the Inuyasha series, fanfictions often delve into how they might overcome their differences and jealousy. For example, some stories might have them teaming up against a common enemy and gradually developing a new understanding of each other.
Some fanfictions might focus on the time before Kikyo died. For example, a story could explore their relationship when they first fell in love. It could show how they interacted, the little moments they shared, and how their love grew. It might also add some new elements to their story, like a secret mission they had to go on together that strengthened their bond.
In some fanfictions, Inuyasha and Kagome might have an argument that actually strengthens their relationship in the end. For instance, they might disagree about how to deal with a certain threat. But through the argument, they both come to understand the other's perspective better. Afterward, they are more in tune with each other's thoughts and feelings, and their bond becomes even more unbreakable.
One possible fanfiction could be about Inuyasha and Kagome going on a journey together. They might face a new and powerful demon. Along the way, Kagome uses her spiritual powers to help Inuyasha in battles. Their relationship deepens as they rely on each other more and more, and they start to realize their true feelings for one another through these shared experiences.