A fanfiction could explore the idea that a magical council from both universes decides to exchange representatives to learn from each other's magic systems. Harry Potter is sent to Regina Mills' world, and they start off as distrustful of each other. But as they face challenges together, like a magical epidemic that affects both worlds, they begin to respect and rely on each other. Their relationship could develop from there, with Harry teaching Regina about some of the more positive aspects of magic he learned at Hogwarts, and Regina showing Harry how to navigate the complex political and magical landscape of her world.
One way they could be related in fanfiction is through a magical crossover event. Maybe a spell gone wrong transports Harry Potter to Regina Mills' world in Storybrooke. There, he could use his magic skills to help or hinder Regina's plans. Another possibility is that they are related through a common ancestor in a magical family tree that spans different fictional universes.
In fanfiction, their relationship can be very complex. Often, Regina is portrayed as a mother who is trying her best to make up for past mistakes. Henry, on the other hand, is sometimes shown as the one who helps Regina see the good in herself. Their relationship can be a journey of forgiveness and growth.
I'm not sure if there are a huge number specifically named 'lemon' fanfictions about Regina Mills and Henry Mills as that's not a very common or appropriate theme for their relationship given it's a mother - son type bond in the original context. However, if you're looking for general positive fanfictions about them, 'Henry's Guide to Regina' is interesting. It shows Henry helping Regina to better understand the modern world and in the process, their relationship grows stronger.
Another common theme is power and its consequences. Regina has had a complex relationship with power throughout the show. Fanfictions often explore how she continues to deal with power, whether she tries to regain it, use it for good, or completely shun it. This theme allows for a lot of interesting character exploration and plot development.
Most official and well - regulated fanfiction communities don't support or promote 'lemon' content. Instead, you could look at Tumblr. There are often discussions and fan - created content about Regina Mills and Henry Mills that are centered around their positive interactions, like their hugs, conversations, and how they grow together as a family - like unit.
There are many great fanfictions out there that focus on Regina Mills and Henry Mills' relationship in a more positive and appropriate way. Instead of seeking lemon fanfiction, you might want to look for ones that explore their emotional bond, like how Regina grows as a mother and Henry matures. For example, some stories might focus on their adventures together in Storybrooke, or how they support each other through difficult times.
There's also 'The Unexpected Bond'. This one stands out because it takes a unique approach to the relationship. Instead of a typical love story setup, it focuses on a friendship that slowly turns into something more between Regina Mills and the reader. It has some great dialogue and interesting sub - plots.
Another one to check out is 'Regina and Emma: Partners in Time'. It takes an alternate universe approach, where they have to face new challenges together. The story is full of action and also has some sweet, tender moments between the two characters, which makes it a great read for fans of Regina Mills and Emma Swan.
One common theme is the exploration of Regina's character development during pregnancy. It could show how she deals with the physical and emotional changes.
The theme of family is often present. The OC could be like a surrogate family member to Regina, filling a void in her life. Also, the theme of self - discovery. As Regina interacts with the OC, she discovers new things about herself, her capabilities, and her desires. This is often a very engaging aspect of Regina Mills OC fanfiction.