Perhaps there's a misunderstanding. Harry asks Ginny in a way that she misinterprets as a joke. So she laughs it off and says no. Then Harry has to clarify his intentions and go through a whole process of making it up to her and asking her again more seriously. And in the end, they do go to the Yule Ball together.
A plot twist might be that just as Harry is about to ask Ginny, someone else asks her first in front of Harry. Ginny is put on the spot and accepts the other person's offer. Harry then has to figure out how to get Ginny to go with him instead, like by doing something really heroic or charming.
One possible plot twist could be that Ginny says no at first. Maybe she has her own reasons like she already promised someone else she'd go with them as friends. But then later she realizes she really wants to go with Harry and finds a way to change her plans.
In the 'Harry asks Ginny to the Yule Ball' fanfiction, it could be that Ginny is initially shocked when Harry asks her. She might have thought he would ask someone else. But after a moment of hesitation, she accepts. And later they have a great time at the ball, dancing and chatting with their friends, and this could be the start of a deeper relationship between them.
Ginny might be in disbelief for a moment. She has always seen Harry as this heroic figure and now he's asking her to the ball. But then her natural confidence would take over and she would accept with enthusiasm. She would also tease Harry a little bit about taking so long to ask her, adding a bit of humor to the situation.
One scenario could be that Harry is really nervous when he asks Ginny. He might stutter a bit and his face could be all red. Ginny, on the other hand, is both surprised and happy. She immediately says yes with a big smile on her face.
Perhaps Harry asks Padma for help regarding his date with Cho. He's all confused about how to make Cho happy at the ball. Padma, being a girl, might give him some useful tips. Like she could tell him about the kind of flowers Cho might like or the type of music she enjoys. This would show Harry's vulnerability and his attempt to make his date a success, while also creating an unexpected bond between him and Padma.
One great fanfiction could be where Harry and Ginny's relationship blossoms at the Yule Ball. Maybe Ginny gets a little jealous of Harry's initial dance partner but then they end up having a magical dance together under the enchanted ceiling.
One possible scenario in this fanfiction could be Harry finally realizing his feelings for Ginny during the Yule Ball. Maybe he sees her across the room, looking stunning in her dress, and for the first time, he really notices her in a romantic way. This could lead to a series of sweet moments between them, like a dance or a private conversation away from the crowd.
The plot could involve some conflict too. For example, Hermione might initially think it's a joke or be hesitant because she's so focused on her studies for the Triwizard Tournament. Harry would then have to convince her that he's serious and that they can still balance the ball with her studies. Or there could be jealousy from other characters who also had their eyes on Hermione for the ball.
One possible scenario could be that Hermione is initially shocked. She might have been expecting someone else to ask her, like Viktor Krum. But then she realizes that Harry is being sincere. She could accept his invitation, and they start preparing for the ball together, sharing nervous laughs and excited chatter about what they'll wear.
A plot idea could be that Ginny is initially asked to the Yule Ball by someone else, but Harry steps in at the last minute. They then have to deal with the fallout from the jilted suitor during the ball. It adds some drama to their otherwise romantic evening.
A really interesting plot twist could be that during the Yule Ball, a spell goes wrong and Harry and Lavender are transported to a different time or place within Hogwarts. They have to work together to find their way back to the ball, and in the process, they learn a lot more about each other than they would have otherwise.