A third key element is the reaction of the other characters in the wizarding world. Friends of Harry and Draco, as well as other Hogwarts students and faculty, will react in different ways to this strange new relationship. Some might be accepting, while others will be confused or even opposed. This adds a lot of drama and conflict to the fanfiction.
One key element is the role reversal. Harry, who is usually an adversary or at least a rival to Draco, now has a nurturing role like a mother. Another element is the change in their relationship dynamics. It's no longer just about schoolyard rivalries but about a more complex, family - like bond.
The exploration of different magical families' values is also important. Since Harry is in the role of Draco's mother, we get to see how he might influence Draco's understanding of the Malfoy family values compared to his own Gryffindor - influenced ideas. It often involves a lot of character growth for both Harry and Draco as they adapt to this new relationship.