Another way is by exploring their pasts. Maybe they discover that they have more in common than they thought in terms of their upbringing in their respective worlds. This newfound knowledge can make them more empathetic towards each other. For instance, if they find out that they both had a mentor figure who had a big impact on their lives, it could create a bond.
I don't have the exact date for when Maou and Emi's light novel is released. Sometimes delays can happen due to various reasons. You could follow the author's blog or the publisher's announcements to stay informed.
Their relationship can be developed through shared experiences. For example, if they go on a mission together to save a human from a demon's curse. During this mission, they would have to rely on each other, communicate more, and understand each other's strengths and weaknesses better. This would bring them closer and deepen their relationship.
A theme could be the challenges they face from the outside world. Maybe their marriage is not accepted by some groups in the fictional universe they belong to, and they have to fight against prejudice. Also, there might be themes about building a family together, like having children or taking care of each other's families in the story.
Another theme might be the reactions of the surrounding characters. Friends, family, or allies in the story would likely have various reactions to the news of the pregnancy, which could add drama and interesting plotlines. For example, some might be overjoyed while others could be worried about how it would affect the characters' roles or the overall story arc. And also, there could be a theme of preparing for the future. This includes things like getting ready a place for the baby, thinking about parenting styles, and how their worldviews might change because of the pregnancy.
The main characters are Maou, the Demon Lord, and Emi, the hero. Maou is a complex character who has his own goals and reasons for his actions, not just a one - dimensional 'evil' being. Emi is strong - willed and determined to fulfill her duty as a hero.