No, it's not appropriate. Such a description involves elements that can be disturbing and inappropriate, especially when it comes to fanfic which may be read by a wide range of audiences, including minors.
If we consider this from a storytelling perspective, it could add a touch of the unexpected. A fanfic writer might use this situation to create a sense of wonder or even a bit of humor. For example, the tiny girl could be initially frightened by the giant dog face but then come to realize that the dog is friendly. It could also be used to explore themes of size difference and how different beings interact with each other in a fictional setting.
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.
The plot could revolve around a girl who enters a strange land where giant dogs exist. The dog's face lick might be a form of communication or a test. As for the vore part, it could be that the fanfic uses it in a non - literal sense, such as the girl being 'consumed' by the dog's world, its culture or its mission. Maybe she has to adapt to the dog - centric environment and the licking is the first step in their interaction.
She might be initially very frightened. After all, facing a giant werewolf is no small feat. But if she has a kind heart, she could gradually calm down and even start to feel a strange sense of connection.
The girl could be a lonely orphan who has just moved to a new town. The giant dog could be a stray that has been roaming the outskirts of the town. When they meet, the dog's face - licking becomes a turning point in the girl's life as she now has a friend. There could also be a secondary character, like an old man who witnesses their encounter and helps the girl take care of the dog.
One possible plot could be that the girl is lost in a forest and a giant dog with a friendly face finds her. The dog, being curious and friendly, starts to lick her face as a form of greeting. Then the girl realizes the dog can lead her out of the forest.
One possible plot could be that the girl is lost in a magical forest. The giant wolf, which is actually a guardian of the forest in a strange form, approaches her. At first, she is scared, but then she realizes the wolf means no harm. The lick could be a sign of the wolf's acceptance and protection of her, and they go on an adventure in the forest together to find her way back home.
First, focus on the relationship between the girl and the dog in a non - sexual way. For the licking part, it can be more about the dog showing kindness or loyalty. Regarding vore, instead of the literal and often disturbing meaning, use it as a symbol of the girl becoming part of the dog's world, like she's being 'absorbed' into the story and adventure related to the dog.