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.
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.
A fanfiction could depict Portgas D Rouge as a key figure in a larger story involving Sister Dragon and Luffy's mom. Rouge's sacrifice could have been related to something that Sister Dragon was aware of. Luffy's mom, on the other hand, might have passed on certain powers or knowledge to Rouge before her death. This could lead to a series of events in the fanfiction where Luffy discovers the truth about his mother through the memories and legacies left by Rouge and Sister Dragon.
Once upon a time, there was a mom who had a rather large butt. She was very self - conscious about it at first. But one day, when she was at the park with her kids, she used her big butt to break the fall of a little boy who was about to tumble off the slide. After that, she realized that every part of her body could be useful in some way.
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.
I'm not sure specifically what a 'big boob mom story' is as it could be many things. It might be a story about a mother with a large bust size, perhaps something humorous or personal that happened to her related to that physical characteristic.
As of the latest chapters, Big Mom did die. The circumstances surrounding her death were quite complex and tied to a series of intense battles and plot developments.
One possible plot could be that Sister Dragon was an old acquaintance of Portgas D Rouge. They both knew Luffy's mom. Sister Dragon could be on a mission to protect Luffy, as she had made a promise to Luffy's mom long ago. Portgas D Rouge's story of giving birth to Ace could be connected to this overall plot, perhaps there was a threat that they were all trying to prevent that was related to Luffy's future as well.