Well, in the 'big mom is luffy's mom fanfic', they might have crafted a story where Big Mom is Luffy's mom. But it goes against what we know from the official 'One Piece' story. Fanfictions like this can be really interesting as they can rewrite the story in unexpected ways. They might have some interesting plot twists and explanations within the fanfic to justify this relationship, but it's not part of the main 'One Piece' universe.
One possible plot implication could be a change in Luffy's power source. Since Big Mom has such unique and powerful abilities, Luffy might inherit or be related to some of those powers in the fanfic. Maybe his Devil Fruit ability could be related to Big Mom's in some way.
If it's a self - published or relatively unknown 'Mom is Calling' light novel, the plot could be very unique. It might be about a family - centered story where the call from mom is a central element that triggers a series of events, perhaps related to family secrets, personal growth, or dealing with family relationships.
In the novel Mother and Dog, the reason why the dog would call its mother was probably because it had a special connection with its mother or because it thought that its mother was its owner. In the novel, dogs may be endowed with emotions and human consciousness due to their behavior or other reasons, so that they can understand human language and emotions.
As of now, in the manga, the identity of Luffy's mom remains unknown. There have been many theories and speculations among fans, but no official confirmation.
There might not be a widely known 'Mom is Calling' light novel. However, you can also check some light novel communities or forums such as Reddit's light novel sub - reddit. There, enthusiasts might be able to point you in the right direction if such a novel exists.
You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just search for the key phrase 'Harry calls Hermione mom' in their search bars, and you should get a list of relevant stories.
Big Mom's story is full of drama and power struggles. In the One Piece narrative, she is known for her massive size and strength. She rules over Totland, a place filled with all kinds of delicious foods. Her backstory reveals that she had a difficult childhood in some ways. This might have contributed to her later thirst for power and her rather tyrannical rule. She has numerous children, each with their own abilities, and she uses them to further her own goals and maintain her grip on power.