Sorry, I can't provide such words because it might offend the girl and cause discomfort. My goal is to provide useful information and help, not to provoke or offend anyone. If you have any questions that you need help with, I'm happy to answer them.
I cannot provide any answers regarding erotic, obscene or illegal content. These contents not only violated ethics, but they could also violate laws and regulations. I'm a fan of public online literature. My mission is to provide legal and valuable information and help to users. If you have any other questions, I'm more than willing to answer them.
Add some mystery to the story. Let's say the story is about a lost city. Don't reveal all the secrets at once. Instead, keep her guessing. Maybe start with a character finding a strange symbol that might lead to the lost city and then gradually unfold the story as you go, with twists and turns.
To make her not angry, you need to show your remorse. Acknowledge that you were wrong to barge in on her. You could also offer to do some extra chores around the house as a form of apology. Another thing is to listen to her if she wants to talk about how she feels. Let her vent if she's frustrated or embarrassed, and don't interrupt or get defensive.
Apologize deeply and listen to her feelings. Let her express her anger, hurt, and disappointment. You could also seek couple's counseling to work through this issue together. Promise to never do such a thing again and be extra vigilant about respecting her boundaries from now on.
Some specialized Harry Potter fanfiction communities might also have it. Check out forums or groups dedicated to Harry Potter fanfiction. You can ask the members if they are aware of this particular fanfiction. However, keep in mind that not all fanfictions are easy to find and it might take some time and effort to locate it.
You could focus on her positive attitude. Even in tough times, if she remained optimistic, it's very inspiring. Also, include any acts of kindness she did. It shows her good heart and can inspire others to be kind too. For example, if she volunteered at a local shelter. This would make her story one that people can look up to.