It could be that the 'novel' is personified in some way. In a fictional world where stories can come to life, the hero might be obligated to marry the story (novel) itself. This could be due to a prophecy that says marrying the novel will bring peace or some great benefit to the world he lives in.
Perhaps the hero is an author who has put so much of himself into the creation of the novel that it has become an integral part of his life. And in a very metaphorical sense, he has to marry the novel, meaning he has to fully embrace and be committed to it, like a marriage. Maybe it's a way to show that he will never abandon this work and will always be loyal to the story he has created.
In some fictional settings, there might be a cultural or religious obligation within the context of the story. The hero might belong to a society where such an unusual marriage is seen as a solution to a problem. For instance, if the 'her novel' is personified as a deity or a very important figure in their fictional lore, marrying it could be a way to restore balance or gain favor.
The hero might be a bit of an eccentric. Marrying a novel is not a common thing, so it could suggest that he is not afraid to go against the norm and do something completely out of the ordinary. This could also mean he has a very creative and open - minded way of thinking.
In this kind of fanfiction, a really interesting plot twist could be that the princess and the prince are from two warring kingdoms. The forced marriage is seen as a way to end the war. But as they get closer, they find out that there are other forces at work trying to keep the war going. So, they have to not only deal with the forced aspect of their relationship but also figure out who is behind the plot to keep their kingdoms at war. This could involve them going on a secret mission together and falling in love in the process, which completely changes the nature of the forced marriage.
One possible plot development could be that at first Harry is extremely resistant. He might try to find ways to break the forced marriage. Maybe he'll seek help from his friends like Hermione and Ron. They could try to look for magical laws or loopholes to dissolve the situation.
Well, it could be about a hidden demon that is secretly influencing the events in a particular fictional world. Maybe it's causing chaos among the characters without them fully realizing it at first.
One possible plot development could be that Naruto is initially shocked by Fem Kyuubi's proposal. He might be hesitant because he has his own goals and relationships in the village. However, as the story progresses, he could start to see the good in her and consider the idea. Maybe she shows him a side of her that is kind and caring, different from the fearsome Kyuubi he knew before.
Well, it could be about the main character finally getting their big break in Hollywood on day 10. Maybe they land a major role in a blockbuster movie and have to navigate the challenges of working with a big - name director.
Perhaps the hero comes from a different background or culture that clashes with the values of Overwatch. This could cause the other characters to be suspicious and ultimately reject the hero. For example, if the hero has a very individualistic way of doing things that goes against the team - oriented nature of Overwatch. Also, it could be that there is some sort of false accusation against the hero. Somebody might frame them for a crime or unethical behavior within the Overwatch world, which spreads quickly and results in their rejection even though they are innocent.
One possible plot development could be Izuku's extreme grief. Losing his mother, Inko, would shatter his world. He might become more withdrawn at first, but then turn that pain into a driving force to become an even greater hero, vowing to protect others so no one else has to experience such loss.
One possible plot twist could be that the baby has some sort of special power. Maybe it's a power that is not known in their world and it causes all kinds of chaos and confusion. People might be scared or intrigued by the baby.