They would become more committed to each other. Their relationship would likely shift from a more tentative or even adversarial one in some cases to a more unified front. They would support each other more openly.
One possible plot could be that after years of a tumultuous relationship filled with mistrust and power struggles, Nick and Adalind finally realize their true feelings for each other. They decide to get married in a small, private ceremony surrounded by their closest friends and family. However, their past foes try to disrupt the wedding, but they overcome all the obstacles together and start a new chapter in their lives.
Nick and Adalind's relationship in such a fanfiction could be full of growth. Since they are married, they would be more open with each other. Adalind could finally feel secure in her relationship with Nick. She might share all her secrets about the Wesen world with him without hesitation. Nick, on the other hand, would be more protective of Adalind. They would start to plan their future together, whether it's about building a new community that is more inclusive of both Grimm and Wesen or just living a quiet life away from all the drama. Their relationship would be a journey of discovery, learning about each other's true selves and loving each other despite their differences.
In this type of fanfiction, perhaps Nick and Adalind decide to start anew in a different place away from all the chaos of the Grimm - filled city. They build a home together, and Adalind starts to teach Nick more about the deeper secrets of the Wesen world that she has known for so long. Their marriage could be a symbol of unity between two different worlds. However, they may also face opposition from some traditionalists in both the Grimm and Wesen communities who don't believe in their union.
Their relationship would likely become more stable. They would share a home, which means more shared responsibilities. They would also be more involved in each other's families. Nick might become more protective of Adalind, not just as a Grimm protecting a Wesen, but as a husband. And Adalind would probably be more affectionate towards Nick, showing her love in ways that she might have held back before. There could also be a power shift in their relationship. Since they are married, they would have equal say in decisions, which could be a new dynamic for them considering their different backgrounds.
A plot idea could be that Adalind's past comes back to haunt them. An old enemy or a past mistake she made resurfaces, and Nick has to decide how much he is willing to stand by her. They could also start a family, and the children inherit unique abilities from both of them. This would lead to a whole new set of challenges as they try to protect their family from those who might want to use their children's powers for their own gain.
In many Grimm fanfictions, Nick and Adalind's relationship is complex. Their initial interactions were often filled with mistrust as they were on different sides. But as the story progresses, they start to understand each other more. Their relationship could develop in various ways. For example, they might bond over their shared experiences in the Grimm world, like dealing with different Wesen threats. This could lead to a deep friendship that might eventually turn into a romantic relationship, with each learning to rely on the other in times of danger.
Another aspect could be the emotional journey. Nick might be initially worried about how to be a father, especially considering his dangerous life as a Grimm. Adalind, on the other hand, could be conflicted between her past actions and her new role as a mother - to - be. Their relationship could be put to the test as they navigate through these complex emotions.
A fanfiction could focus on baby Diana's growth. Nick and Adalind are constantly amazed by how fast she is developing. Diana seems to have an uncanny ability to sense danger before it arrives. Nick starts training her in self - defense at a very young age, with Adalind being a bit hesitant at first but then realizing it's necessary for their unique family situation.
The relationship between Nick and Adalind in relation to their baby in fanfiction can be quite complex. There could be stories where they struggle to co - parent due to their different natures. Nick, being a Grimm, and Adalind, a Hexenbiest, might have different ideas about how to raise the child. However, in many fanfictions, they also find common ground and work together for the sake of their baby.