One scenario could be that Daphne is bullied by some Slytherins for not conforming to their pure - blood ideals. Harry, having been bullied himself, steps in. He tells her that their opinions don't matter and that she is a great person regardless. He might even offer to practice defensive magic with her so she can stand up for herself.
You can try fanfiction websites like FanFiction.net or Archive of Our Own (AO3). Just use the search function and type in 'daphne comforts harry' and you'll likely find a variety of stories.
There are 'daphne comforts harry fanfiction' where Daphne discovers Harry's nightmares about Voldemort. She decides to stay by his side at night, using a charm to keep the nightmares at bay. As time passes, they form a deep bond, and she becomes an important part of his support system during the fight against the Dark Lord.
One common theme is friendship. Even if they might not have been close friends originally, Daphne reaches out to Harry in a time of need, showing that friendship can form in unexpected ways. For example, in many fics, Daphne sees Harry's pain and decides to be there for him without any ulterior motives.
Another one is 'Comfort in the Dark'. In this story, Daphne discovers Harry having nightmares. She uses magic to create a calming environment for him and stays by his side until he feels better. The way the author writes about Daphne's gentle approach to Harry's distress is really touching.
The relationship could also develop through cultural exchange. Daphne, being from a pure - blood Slytherin family, has different values and traditions compared to Harry. As they get to know each other, they introduce their respective cultures to one another. This leads to a deeper understanding and a more profound emotional connection between them.
In some fanfictions, their relationship develops through shared secrets. Daphne might share some Slytherin secrets with Harry, and in return, Harry tells her about his experiences with Voldemort. This sharing of personal and important information brings them closer together. They start to rely on each other more and more, and eventually, their relationship can range from a deep friendship to a romantic one, depending on the direction of the fanfiction.
Hermione could be involved. She might suspect Daphne of having ulterior motives regarding Harry and try to warn him, which could play into the betrayal storyline in some way, either as a catalyst or as someone who helps Harry deal with the betrayal later.
The 'Harry and Daphne Obliviate' fanfiction concept is really cool. When Obliviate is involved, it can explore themes of power and responsibility. Harry, having experienced the misuse of powerful magic, should be more cautious. But if he uses Obliviate on Daphne, it might be out of good intentions like protecting her from a dark secret. However, Daphne might feel violated when she realizes her memories have been tampered with, which can lead to conflict between them and drive the plot forward in many different ways.
Yes, in some fanfictions Daphne can be Harry's mate. Writers often create alternative pairings in fanfiction, and Daphne is a character that some authors choose to pair with Harry for various reasons, like creating new storylines or exploring different character dynamics.