It's possible that Hermione will become more of a risk - taker because of Snape. His Slytherin - like qualities of being cunning and resourceful might rub off on her. She could start to approach problems in a different way. Snape could also develop a new purpose in life. Through his interactions with Hermione, he could find a reason to be more involved in the present and future of Hogwarts, rather than being stuck in his past grievances.
For Hermione, she might develop a more empathetic side towards Snape. She could start to understand his past traumas and the reasons behind his cold exterior. This could make her less judgmental and more open - minded. As for Snape, he could soften up. With Hermione's influence, he might show his more vulnerable side and let go of some of his grudges, especially towards the students he disliked at Hogwarts.
One possible character development is that Hermione becomes more secretive. As the heir of Slytherin, she might have to hide this fact from others, which would make her more guarded. Another development could be that she becomes more ambitious in a different way. Instead of just aiming for academic success as a Gryffindor, she might start to pursue power or influence within Hogwarts in a more Slytherin - like manner. She could also develop a more complex relationship with the concept of the dark arts. Since Slytherin has a connection to it, she might have to explore and understand it better, which could lead to a more nuanced view of magic in general.
The plot could involve the mistletoe having some sort of magical effect. Maybe it makes Snape and Hermione relive certain memories. As they do, they start to understand each other better. For instance, they might see how they both overcame difficulties in their pasts, and this new understanding could bring them closer together.
One possible plot development could be that Snape's claim over Hermione creates a great deal of conflict within the wizarding world. The Order of the Phoenix might see it as a threat or a strange alliance. Hermione herself could initially resist but then start to understand Snape's motives, which could be related to protecting her from a greater danger.
One problem is the ethical issue. The idea of slavery is unacceptable in modern society and goes against basic human rights values. Incorporating it into fanfic can send the wrong message.
In this type of fanfiction, Hermione would likely experience a great deal of internal conflict. On one hand, she has her own moral compass which is firmly against Voldemort's ideology. On the other hand, she's in his care. This could lead to her developing a stronger will and a more nuanced understanding of good and evil. Voldemort could develop a strange sort of affection for Hermione, which would be a new aspect to his character. He might be more protective of her than his other followers. And for the other Hogwarts students, they would view Hermione with a mix of fear and confusion. Some might try to rescue her, while others would be too afraid to get involved.
For Albus Severus Potter, he could start off as a bit of a skeptic about Snape. But as he delves deeper into Snape's past, he could develop into a strong advocate for Snape's honor. He might become more confident in himself as he realizes the complexity of the wizarding world's history that Snape was a part of.
One possible plot development could be the initial shock and confusion for both Harry and Hermione. They would have to deal with the reactions of their friends, like Ron, who might be very surprised or even a bit jealous. Then they'd need to figure out how to balance their new situation with their fight against Voldemort or other magical threats. Another aspect could be how they prepare for the baby, from finding a safe place to live to getting all the necessary baby supplies in the wizarding world.
She might get detention. Snape is strict, and cutting class is a serious offense in Hogwarts. He could assign her to clean the potions classroom or help with sorting ingredients in the dungeon.
She could develop a more assertive personality. As a tomboy, she might become more outspoken and not be afraid to voice her opinions, even if they go against the norm. For instance, she could challenge the old - fashioned views of some of the Hogwarts professors regarding gender roles in magic.
The plot could also be about how Hermione and Snape's marriage affects the Hogwarts community. Their union could cause a stir among the students and teachers. Some might oppose it, thinking it's inappropriate. But as they see Hermione and Snape working together for the betterment of the school, like Hermione introducing new educational methods and Snape sharing his expertise in potions and the Dark Arts in a more positive light, the community gradually accepts their relationship. This could also lead to a new era of unity and understanding within Hogwarts.