Yes, there are some fanfictions in this theme that manage to develop the relationship quite well. Some authors take their time to build the connection between Harry and the Malfoy character. They might start with Harry's escape to the Malfoy place for some reason, like being on the run from dark forces. Then, through shared experiences, they gradually grow closer. For example, they could find common ground in their views on magic despite their family differences. This slow - burn development makes the relationship believable in many of these fanfictions.
Well, a typical plot device is the danger that drives Harry to the Malfoys' in the first place. It could be that he's being chased by Death Eaters or some other dark force. Then, there's the element of family opposition. Their families have been enemies, so the relationship is forbidden in a sense, which adds to the drama. And often, there's the character growth aspect. Both Harry and the Malfoy character grow as individuals while falling in love, like Harry learning to see beyond the Malfoy family's bad reputation and the Malfoy learning about true friendship and love from Harry.
The Malfoys could save Harry in fanfiction because of a personal debt. Maybe Harry once unknowingly did something that benefited the Malfoys greatly. This could be as simple as preventing a disaster from befalling their family business or saving the life of a family member secretly. When the time comes, the Malfoys feel obliged to return the favor and save Harry from whatever danger he is in. Also, it could be part of a complex plot where the Malfoys are trying to redeem themselves, and saving Harry is a big step in that direction.
In Harry Potter fanfiction, the Malfoys are often portrayed in a more complex and sometimes positive light. Some fanfictions might explore Draco Malfoy's struggle between his family's beliefs and his own emerging sense of right and wrong. He could be shown as having a change of heart, perhaps influenced by his interactions with Harry and his friends. This gives a new dimension to his character that we don't fully see in the original books.
It could also be a part of a plot by the Malfoys to gain influence. They know Harry is a well - known figure in the wizarding world. By calling him and interacting with him, they might hope to improve their public image or gain some political leverage within the wizarding community.
In fanfiction, their relationship can be complex. Sometimes they might be forced to work together against a common dark threat. For example, in some stories, a new dark wizard arises who is more powerful than Voldemort, and both Harry Potter and the Malfoys have to put aside their differences to stop this new evil. It could also involve a change in Draco Malfoy's character, where he starts to see Harry in a different light and they form an uneasy alliance.
In the 'Harry adopted by the Malfoys' fanfiction, one possibility is that Harry would receive a very different kind of magical education. The Malfoys might try to mold him into a Slytherin - like wizard, but Harry's own Gryffindor - like courage would constantly be at odds with that. Also, his relationship with Draco could be very complex, ranging from initial rivalry as they are brought up in the same household to a possible understanding and even friendship later on.
Well, in such a fanfiction, Harry might be given a very different education. The Malfoys could try to indoctrinate him with pure - blood supremacist ideas at first. But as he grows, he might rebel against it. He could also be exposed to a different social circle within the wizarding world. Maybe he would have more interactions with other Slytherin families and this would change how he views things like House rivalries. And his relationship with Dumbledore would be very strained as the Malfoys are not on good terms with Dumbledore.
One example of 'good Malfoys' in fanfiction could be a scenario where Draco Malfoy has a change of heart early on. He might start to question the pure - blood ideology his family has instilled in him. In some fanfictions, he could secretly help Harry Potter and his friends. This could be due to a growing sense of morality within him, seeing the unjust actions of the Death Eaters.
Family bonds can also play a role. If the Malfoys, especially Narcissa, see that Voldemort's actions are endangering Draco, they might turn against the Dark Lord. Their love for their family member can override their loyalty to the Dark side, making them 'good' in the context of the fanfiction.