They would probably become like brothers. With Snape as their common father figure, they would have to learn to get along. Harry might be more forgiving of Draco's past actions, and Draco would have to let go of his animosity towards Harry.
The relationship would be drastically different. Harry, who has always seen Snape as a rather unlikable figure, would start to see him in a new light. He might come to respect Snape as a father figure. Draco, who has some connection to Snape through his family, would now have a more personal and perhaps more positive relationship with Snape. Snape himself would have to soften his usual harsh demeanor towards Harry. And between Harry and Draco, they would be forced to get along better as they are now under the same roof. They might start to understand each other's insecurities and backgrounds more.
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.
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 change in a more positive way. In detention, they might have to rely on each other to get through Snape's tasks. If they are made to work on a complex magical experiment, they would need to communicate. This communication could break down some of the barriers between them. Maybe they start to exchange a few friendly words outside of detention, slowly building a more amicable relationship.
Well, considering Harry, his relationship with the other Gryffindors could be affected. Some might think he has turned to the 'dark side' since he is now under Snape's care. But others might understand that Harry has no choice in the matter. Draco's relationship with Hagrid could be very interesting. Hagrid might be very cautious around Draco now that he is with Snape. And Snape's relationship with the other Hogwarts professors would also change. Some might be more understanding, while others might think Snape is overstepping his boundaries. But overall, these new family dynamics would cause a ripple effect throughout the wizarding world.
It often changes for the better. After Harry apologizes, Draco might be initially skeptical. But as they start to interact more, they could become friends or at least develop a mutual respect. For instance, they might start sharing their experiences during the war, which helps them understand each other better.
At first, Harry and Draco would be at odds in prison. Harry, with his sense of justice, would be disgusted by Draco's past actions. Draco, on the other hand, would be resentful of Harry's 'holier - than - thou' attitude. But as they are forced to live in close quarters and face common threats, they might begin to communicate. They could share their fears and hopes. Slowly, this could lead to a grudging respect for each other. Maybe Draco would open up about his family's pressures, and Harry would understand his situation better. This could transform their relationship from enmity to a more amicable one.
At first, it would become more strained. Harry would likely be angry and hurt by Draco's actions that made him cry, so he might avoid Draco even more than before. He might also be more on guard around Draco, not trusting him at all.
Their relationship would likely become more collaborative. They would have to communicate regularly about Teddy's needs, like his schoolwork, his magical training, and his emotional well - being. This would force them to put aside their past grudges and start seeing each other in a new light.
At first, it might be rocky. Draco, used to his pure - blood superiority, would be a bit resentful of having to share his home and life with Harry. But as time passes, they'd start to see each other's good qualities. Harry's bravery would impress Draco, and Draco's cunning could earn Harry's respect. Eventually, they'd become close friends, always having each other's backs.