Maybe it's a story set in a workplace. The black man is a very talented and hardworking colleague. The white gf at first has some preconceived notions. However, they are paired for a project. During the process, she sees his leadership skills and his positive attitude towards life. This makes her submit to his way of thinking and eventually fall in love with him.
One possible plot could be that they meet in a university setting. The white girl is initially hesitant about the relationship due to social norms and her own upbringing. But as she gets to know the black man better, she realizes his kindness, intelligence and charm. They start to date and she gradually submits, in the sense of fully accepting and loving him for who he is, despite what others may think.
It can show that love doesn't see color. When a white gf submits to a black man in a story, it breaks down the barriers of racial stereotypes. People reading the story will see that relationships are based on mutual respect and attraction, not skin color.
One challenge could be dealing with family reactions. Some families might have preconceived notions based on race and be hesitant or even opposed at first. Another is facing society's stares and sometimes unspoken prejudice. People might make assumptions about their relationship just based on their skin colors.
One reason could be that she feels a lack of excitement in her current relationship. The black man might represent something new and different. For example, he could have a different cultural background that she finds fascinating. Another reason could be that she and her current partner have communication issues, and the new person, being a black man in this case, seems more understanding.
Once there was a black man named James. He met a white girl, Lily, at a coffee shop. They started chatting about their love for books. They soon found out they had a lot in common. They went on dates, like going to the park and having picnics. Eventually, they fell in love and overcame all the cultural differences and stares from some people in the society.
One possible plot could be a magical or scientific experiment gone wrong. Maybe a white man enters a strange laboratory and an accident occurs during an experiment on genetic transformation, turning him into a black woman.
Let's say there was a white girl, Emma. She was dating a white boy. But she found herself increasingly interested in a black man, Tyrone. Tyrone was very different from her boyfriend, more adventurous. Emma started to cheat by texting Tyrone constantly and meeting him in secret places. Her boyfriend suspected something was wrong when she became overly protective of her phone. He finally found out about Emma's relationship with Tyrone and it led to a big argument and the end of their relationship.
One possible plot could be that the mom really likes a girl she knows, like a daughter of a friend. She then tries to set up her son with this girl. She might arrange a lot of 'accidental' meetings, or constantly talk about the girl's good qualities to her son until finally, the son starts to consider the girl as a potential girlfriend.
Perhaps the white wife decides to take Spanish lessons and by chance, she is paired with a black man in a language class. They bond over their shared experiences in learning a new language. The black man might introduce her to different Spanish - speaking cultures, like his own family's traditions if he has Hispanic roots. They could end up using their new language skills to communicate with Spanish - speaking communities in their area.
It could be about a white woman who is learning Spanish and has an interaction with a black man during her Spanish - learning journey. Maybe they become friends and help each other in language learning.
It could be that after a series of events that make Harry question his own judgment, he submits to Dumbledore's authority. For instance, if there are false prophecies or misinformation floating around that lead Harry astray. Dumbledore, with his greater experience and knowledge, helps Harry see the truth. So Harry decides to submit to Dumbledore in order to get back on the right track and protect Hogwarts and the wizarding world.