Another option is to ask in fanfiction - related forums or groups. There are often communities dedicated to a particular fandom, and members might be able to tell you who the author of 'hermione knows moony won't hurt her' is if they are familiar with the piece.
To find out who the author is, you could try searching for the fanfiction on popular fanfiction websites. Look for any author names or pen - names associated with it. Sometimes, these websites have a 'by' section next to the title which will tell you who wrote it.
One key plot point could be that Moony has a history of protecting those he considers friends or allies. In the wizarding world lore, he has shown loyalty and kindness despite his lycanthropy. So in this fanfiction, it might be that he has previously saved Hermione from some danger, which makes her certain he won't hurt her.
Generally, in the realm of fanfiction, Moony is not depicted as harming Hermione during his transformation. It's a common trope to maintain their positive relationship.
Perhaps it's a writer who loves Hermione as a character and wanted to give her a different kind of adventure. They might have created this werewolf - Hermione dynamic to show Hermione's ability to handle unusual and potentially dangerous situations in a new way. Without more information, it's impossible to determine the exact author.
Moony might be protective of Hermione because he has a strong sense of justice. In the wizarding world, Hermione is a Muggle - born, and she often faces discrimination. Moony, being a member of the Order of the Phoenix, is against all forms of prejudice. He would naturally want to protect her from any harm, whether it's from Death Eaters or just general bigotry within the wizarding community. Also, Hermione's intelligence and her role in fighting against the dark forces make her an important asset, and Moony would understand the need to safeguard such a valuable ally.
Hermione might be shocked at first. She's a very logical person, and this sudden connection based on werewolf instincts could be quite unexpected for her. But then, being Hermione, she would likely start to study werewolves more intensively to understand what it means.
Another possibility is a jealous student at Hogwarts. There are always students who might be envious of Hermione's academic achievements. They could set up a prank or a trap that goes wrong and ends up hurting her. For example, a student who is tired of Hermione always getting the top grades in Potions might tamper with her cauldron during a class experiment, resulting in an explosion that hurts her.
One common theme is the exploration of an unexpected friendship. Since they are from different generations in the wizarding world, seeing how they bridge that gap is often explored. For example, Hermione's modern - thinking and Moony's more traditional ways.
Moony might start to avoid Tonks while getting closer to Hermione. He could form a study group or some sort of alliance with Hermione, leaving Tonks out. This would create a rift between Tonks and Moony, and a bond between Moony and Hermione.
The author of " I Won't Be Bullied by Girls " was a fraud.
There's also a chance that it's a werewolf from another wizarding community that has come to Hogwarts and has fixated on Hermione. This werewolf could be on a mission, perhaps sent by a dark wizard, and Hermione just happens to be in his path, and he won't leave her alone as part of his orders.