One possible plot could be that Snape, despite his initial resentment towards James Potter (Harry's father), sees the vulnerability in little Harry. He decides to take him in out of a sense of duty to Lily (Harry's mother). Snape then has to adjust his life to care for a child. He teaches Harry potions at an early age and tries to protect him from the darker elements in the wizarding world. Harry grows up with a different perspective on Snape than in the original story.
Well, perhaps in this fanfiction, Snape adopts Harry because he realizes that Dumbledore's plan to leave Harry with the Dursleys is a terrible idea. Snape takes Harry into his home, which is a small, gloomy but cozy place. He starts to train Harry in both academic and defensive magic secretly. As Harry grows, he discovers Snape's complex past and the reasons behind his cold exterior. This leads to a unique bond between them that is different from the usual mentor - student relationship in the original series.
In this fanfiction, the story could start with Harry finding Snape in a very vulnerable state after the Battle of Hogwarts. Harry feels a deep sense of guilt for how Snape was treated throughout his life. So he decides to adopt him. At first, their relationship is awkward. Snape is still his old sarcastic self, but Harry is determined. As time passes, they discover they have a lot in common. They both lost their parents at a young age, and they both had to face great challenges. This newfound understanding leads to a transformation in their relationship. Harry helps Snape to come out of his shell of bitterness, and Snape teaches Harry more about the Dark Arts in a controlled and ethical way so that Harry can better protect the wizarding world in the future.
One possible plot could be that Snape, out of a sense of guilt or a newfound understanding of Harry's situation, decides to take him in. Snape would have to deal with Harry's grief over his parents and his own complex feelings towards the boy. He might start to teach Harry magic in a more personal and different way than at Hogwarts, leading to a unique bond between them.
One possible plot could be that Snape, seeing Draco's vulnerability after the fall of the Malfoy family in the wizarding war, decides to take him in. Snape would then have to deal with Draco's emotional baggage and his own complex feelings towards the boy. He might try to teach Draco a different set of values than what he was brought up with in the Malfoy household.
Well, perhaps the plot could involve Snape finding an orphaned child in the wizarding world. He might initially be hesitant but then grow attached as he sees the child's potential. The story could also include Snape teaching the child magic, protecting the child from dark forces, and the two of them forming a unique bond that changes Snape's cold exterior over time.
Well, in this fanfiction, it might start with Snape finding Hermione as a baby in a dangerous place like the Forbidden Forest. He adopts her because he sees her potential even as a baby. As she grows, he teaches her magic in his own strict way, but also forms a deep bond with her. This could lead to some interesting interactions with other Hogwarts faculty who are surprised by Snape's new role as a father figure.
In this type of fanfiction, perhaps Snape initially stumbles upon Hermione being abused by some other students or even adults in the wizarding world. Feeling a sense of responsibility, he adopts her. Snape would introduce her to his world of potions and dark arts knowledge. Hermione's inquisitive nature would blend well with Snape's expertise. They might face challenges from the wizarding community who don't understand their relationship, but they stand strong together, with Hermione gradually learning to trust again and Snape becoming more open and caring.
In such a fanfiction, the plot could involve Snape taking on the role of a father figure to Harry and Draco. He might use his knowledge and skills to protect them from the various threats in the wizarding world. Snape could also teach them advanced magic, which they might not learn otherwise in Hogwarts. And there would likely be a lot of emotional growth for both Harry and Draco as they deal with their new family situation and their past traumas.
It could be an orphaned wizard child from a family that was killed by Death Eaters. This would give Snape an added sense of responsibility as he might feel guilty for being associated with the Death Eaters in the past.
Snape would likely become more nurturing. Instead of just being the strict and often cold Potions master, he would have to show a softer side to take care of Harry. He might be more patient as he guides Harry through his magical education and daily life.
If Snape adopts Harry and Draco, it could change the whole dynamic of Hogwarts. Snape would have to ensure that both boys are getting proper magical education while also taking care of their emotional well - being. Harry might start to see Snape as more than just a teacher who was always tough on him. Draco would be forced to interact with Harry in a more positive way. There could be some really heartwarming moments as Snape tries to show his affection for the two boys in his own, rather gruff way. And perhaps they could all form a strong, if unconventional, family unit.