One possible plot could be that Ichigo, after fusing with Zangetsu, gains new and enhanced powers. He might have to face a powerful new enemy that only his fused form can defeat. Maybe he struggles at first to control the combined power, causing some chaos in the Soul Society.
Rukia would probably be both amazed and a bit worried. Amazed at the new power Ichigo has, but worried about how it might change him. Chad would see it as a natural progression of Ichigo's power and be supportive. Orihime might be a bit scared at first, but then she would see the good in Ichigo's new form and try to encourage him.
The relationship can start with respect. Since Zangetsu is a powerful entity, Ichigo would initially respect her strength. As they interact more, like during training sessions, they can start to share personal stories. This sharing can lead to a deeper emotional connection.
Perhaps in the fanfiction, Female Zangetsu has been separated from Ichigo due to some dark magic. Ichigo then has to embark on a journey to find her. Along the way, he discovers more about her past and her true nature, which deepens his love for her when they are finally reunited.
When I first met an old man, it was during a community gardening project. He had so much knowledge about plants and their care. He taught me how to properly plant a sapling and told me stories of how the garden used to be in the past. His wrinkled hands showed the years of hard work in the soil, and his eyes sparkled when he talked about his love for gardening. It was a great learning experience for me.
Engaging in group activities together is a good way. Say they join a senior walking club. While walking, they can talk about the scenery, their health, and gradually get to know each other better. This helps in building a connection as they are sharing an experience at the same time.
There were a few novels that could be recommended. One of them was " Nirvana Rebirth: The AdorkablePrincess Wants Candies." The protagonist wanted to eat candy the first time they met, and the plot was very sweet. The other book was " You're Not as Bright as I Am ". The first time the male and female leads met was during an internship. The female lead grabbed the male lead's wrist and refused to let go. The male lead refused the female lead's invitation, but in the end, he sent the female lead home. The other book was " The Conquest Game: A Beautiful Wife Is Hard to Tame." The male and female protagonists met for the first time in a bar, and the male protagonist mistakenly thought that the female protagonist was a lady. The second time they met was on the racing track. These novels all have different plots and backgrounds. I hope you can choose a novel that you like according to your preferences.
Such novels were often called "confrontational novels" because the confrontation between the two old men was often one of the main plots of the story. Such novels usually described the conflict of interest between two old men, emotional entanglements, and the confrontation of moral values. Usually, a young man would be portrayed as the protagonist to help the two old men achieve their respective goals.
Such novels often involved knowledge in the fields of psychology, philosophy, history, etc. Because the confrontation between the old men often involved many complicated issues such as power, interests, beliefs, desires, and so on. At the same time, the young man's character often played a key role in driving the development of the story. Their fate was often inseparable from the goals of the two old men.
You can expect a different perspective. They've seen life from a different vantage point compared to younger generations. They might have different values based on their upbringing. For instance, they could place a higher value on family and community because that's how they grew up. Also, they may be more patient in conversations, taking their time to really explain things.
Well, one possible scenario is that Ichigo could try to warn his younger self about the upcoming battles and hardships. He might give some tips on how to better control his powers from the start, which could potentially change the course of his journey in the original story.