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.
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.
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.
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.
In the 'sirius adopts draco fanfiction', the plot might involve Sirius rescuing Draco from a dangerous situation at home. Sirius might see a bit of himself in Draco, like the struggle between good and bad. As Draco starts living with Sirius, he is exposed to a whole new way of life. Sirius tries to get Draco interested in the Order of the Phoenix's cause. Draco, on the other hand, has to adapt to a more inclusive and less prejudiced household. There could be a lot of conflict within Draco as he tries to balance his old identity as a Malfoy and his new life with Sirius.
One possible plot could be that Snape, seeing the troubled situations of both Harry and Draco, decides to take them under his wing. He could start by teaching them more advanced magic in a strict but fair way. Harry might initially be resistant as he has his own ideas about Snape, but gradually realizes Snape's good intentions. Draco, on the other hand, might struggle with the idea of being under Snape's authority as he is used to his family's influence. They could all learn to live together, with Snape guiding them through the challenges of Hogwarts and the wizarding world at large.
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, 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 the fanfiction, their relationship would be complex at the start. Snape, having his own demons and secrets, would be a bit of an enigma to Draco. Draco, on the other hand, would be dealing with the loss of his family's status. Snape would start by providing a stable home for Draco. As they interact more, Draco would notice Snape's small acts of kindness. Snape would encourage Draco to explore his own identity outside of the Malfoy name. This would lead to a closer relationship, with Snape teaching Draco about things like loyalty, sacrifice, and the true nature of magic, and Draco in turn bringing out a more human side of Snape.
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.