In the fanfiction, their relationship could be one of mutual admiration. The baby brother could look up to Hermione as a role model, seeing her as a source of inspiration. And Hermione could be in awe of how quickly he picks up new things, like magic spells or concepts, and they could bond over their shared love for magic.
Perhaps their relationship is a bit more complex. The baby brother might feel overshadowed by Hermione's achievements at first. But as he grows, they learn to support each other in different ways. Hermione could encourage him to pursue his own interests, whether it's in a different area of magic or something completely non - magical, and in turn, he could bring out a more carefree side of Hermione.
In the fanfiction, they could have a very protective relationship. The brother might always be looking out for Hermione, especially in dangerous situations at Hogwarts. He could be like a secret guardian, using his own unique skills and knowledge to keep her safe.
Well, they could be very protective of each other. Hermione, being the intelligent and strong - willed witch she is, might take it upon herself to teach her little brother all she knows about magic. And her little brother could look up to her and be her biggest supporter in Hogwarts, always cheering her on during her academic achievements and adventures.
His presence could make Hermione more responsible. She might have to take on babysitting duties, which would cut into her study time, but also teach her about time management in a new way. For example, she'd have to find time to study while also making sure her baby brother is safe and happy.
Maybe they embark on a journey to rescue a captured wizard or witch. They use their different strengths - Hermione's strategic thinking and her brother's charm or ability to make quick friends in the wizarding world - to plan and execute the rescue mission.
Their relationship would shift from a purely platonic friendship to a deeply committed partnership. Harry would become more protective of Hermione, not just as a friend but as the mother of his child. Hermione would see Harry in a new light, as a co - parent and a life - long partner. They would have to communicate on a different level, sharing not only their thoughts about the baby but also their hopes and fears for their future as a family. There would also be some awkward moments as they adjust to this new dynamic, especially in front of their old friends who are used to seeing them as just friends.
In the fanfiction, it could be that the baby is a result of some sort of magical accident. Hermione then has to deal with the challenges of raising a child she didn't plan for. She might have to search for a way to reverse the situation if she feels she's not ready, or she could embrace motherhood and learn to adapt her life around the baby's needs.
Maybe the story could be about Hermione trying to protect the baby from dark forces in the wizarding world while keeping its existence a secret. She might have to face challenges alone without the support of her friends at first.
In the fanfiction, Hermione and her older sister could have a complex relationship. Maybe the sister is overprotective, constantly looking out for Hermione at Hogwarts, especially with all the dangerous situations she gets into. The sister could also be a bit jealous of Hermione's academic success and magical abilities, which could lead to some sibling rivalry.
Perhaps the baby's existence causes a rift in the wizarding world. Some might view it as an abomination due to the age and past relationship between Hermione and Severus. This could lead to Hermione and Severus having to fight not only for their baby's safety but also for their right to be a family in a world full of prejudice.
Another option is that the father could be Harry, but in a very different and alternative take on the story. Maybe there was a situation where they got closer than friends during a difficult time and it led to the baby. However, this would be a very radical departure from the original relationships in the series.