Maybe the dog protects the girl from some danger. For example, when the girl is in the forest and faces a wild animal, the dog bravely steps forward to drive the animal away.
It could be that the dog helps the girl find her way home. The girl gets lost in an unfamiliar place, and the dog, with its amazing sense of smell or some kind of instinct, leads the girl back to safety.
The plot could be about a girl who finds a stray dog and decides to take it home. She then takes care of the dog, they become best friends, and have all kinds of adventures together, like exploring the woods near their house.
Maybe the girl and the dog are living in the cabbin and they have a daily routine like going for walks in the woods near the cabbin. The dog protects the girl from any wild animals that might come around.
The plot could start with a girl and her pet dog going to a carnival. There, a mysterious hypnotist is performing. The girl is intrigued and gets hypnotized. She then enters a world where she and her dog can communicate on a deeper level. They might go on a journey through a dream - like place together.
It could be a scientific experiment gone wrong. Some mad scientist was trying to create a new form of life or test a new drug, and the girl, who might be a volunteer or an accidental victim, ends up transforming into a dog.
Well, clearly the dog and the girl are the main characters. The dog might be a heroic character with special abilities.
A story could be that the girl is a volunteer at an animal shelter. One day, a nude dog is brought in. She calls in the veterinarian. The vet examines the dog and finds that it has been severely malnourished, which has led to its fur loss. The vet starts a special diet plan for the dog. The girl is in charge of feeding the dog according to the plan. As the dog gets better, its fur starts to grow back. The girl and the vet are proud of the dog's transformation and they find a loving home for the dog together.
In a 'big dog licks girl' fanfic, perhaps the girl is new to the area and feels a bit lonely. The big dog, which belongs to a neighbor, senses her loneliness. The dog's licking is a way to break the ice. Then, as time passes, the girl and the dog develop a special bond and she starts helping the neighbor take care of the dog more often.
Maybe it's a story where the girl is in danger and her dog bravely protects her. For example, there could be a situation where a stranger approaches the girl menacingly at night, and the dog barks and scares the stranger away. The girl then realizes how lucky she is to have such a loyal friend.
One possible plot could be that the girl is lost in the woods and a friendly giant dog finds her. The dog, being overly affectionate, licks her face as a form of greeting. Then, the girl and the dog form an unlikely bond and the dog helps her find her way back home.
One possible plot could be that the girl is an alien researcher. The alien dog, which has a unique face, forms an unexpected bond with her. It starts by licking her as a sign of affection, and they go on adventures together in an alien world, facing various challenges and learning about each other's species.