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Hermione would also face the challenge of secrecy. If the wrong people found out, it could put her in danger. And she might have to constantly lie to her friends and family, which would be really hard for someone as honest as her. In some fanfictions, this internal struggle is really well - explored.
One possible plot could be that a girl gets lost in the forest and is found by a werewolf. Instead of harming her, the werewolf is curiously drawn to her and gently licks her face as a sign of an unusual connection. The girl, at first terrified, gradually realizes the werewolf has a kind of protective instinct towards her and they form an unexpected bond.
She might face discrimination. In the ninja world where she comes from, werewolves could be seen as monsters. So she'd have to deal with people being afraid of her or trying to hunt her down.
Their different powers could also be an issue. The werewolf has super strength and speed, especially during a full moon. The vampire has the power of seduction and can fly. These powers could sometimes clash. For instance, if the werewolf gets too angry during a fight, its uncontrollable strength might accidentally harm the vampire. And the vampire's power of seduction might make the werewolf jealous if used on others. All these differences in their powers can cause problems in their love story.
The werewolf's past and family situation could also pose challenges. Maybe they come from a family that has a bad reputation in the werewolf community or among wizards. This could make it difficult for Harry and the werewolf to fully trust each other at first. And as they grow closer, the werewolf might worry about dragging Harry into their family's problems or being rejected because of it.
In some Twilight fanfics, a werewolf face - licking a girl could be a sign of an intense connection. It might be a way to show the werewolf's protectiveness or a unique form of affection within the context of the story. It could also be a creative and somewhat strange way the author has chosen to explore the relationship between the werewolf character and the girl character.
To write such a scene, start with the werewolf's perspective. What is it thinking and feeling at that moment? Is it driven by a primal urge or a more tender emotion? Then, when it comes to the act of face - licking, use vivid language. For example, 'The werewolf's warm tongue flicked out, tracing a gentle path along the girl's smooth cheek.' After that, explore the girl's response. Does she pull away in surprise or lean into it? You also need to consider how this scene fits into the overall plot of the fanfic and what it will lead to in the future relationship between the two characters.
In the world of Harry Potter fanfiction, there is a vast variety of stories. However, the idea of a 'giant werewolf face lick girl' is not a common or canonical theme. Fanfic usually adheres to the general spirit of the original series, which is about adventure, mystery, and the growth of the characters. So it's very unlikely to find such a plot in mainstream fanfic.
I'm not sure if there is a specific 'Harry Potter' fanfic with exactly that scenario. Fanfic can cover a vast range of themes and ideas, but this seems like a rather specific and perhaps not very common one. It could exist in the huge world of 'Harry Potter' fan creations, but it would take some searching through fanfic platforms to find out for sure.