A third plot development might involve Snape facing opposition from the wizarding community. Some might think he has ulterior motives for taking in an abused Harry. Snape would then have to prove that his intentions are pure. He could take Harry on trips to learn about his family history in a more positive light, away from the shadow of the Dursleys' abuse, and in the process, Snape might also come to terms with his own past and his relationship with the Potters.
One possible plot development could be that Snape initially struggles with his feelings towards Harry. He has his own past grudges against James Potter, but as he sees the extent of Harry's abuse, his protective instincts kick in. He might start teaching Harry advanced magic in secret, away from the prying eyes of the other Hogwarts staff and students, especially those who might be skeptical of Snape's motives.
There could be a plot development where the Weasleys' discovery of Harry's abuse leads to a rift in the wizarding community. Some might not believe Harry was abused or might try to cover it up. The Weasleys would then have to fight against this disbelief and secrecy. They could also form alliances with other families or characters who believe Harry. In the meantime, Harry might start to develop new magical abilities as a result of the love and support he gets from the Weasleys. This could be a turning point in his growth as a wizard, as he learns to use his magic in a more positive and confident way.
One possible plot development could be that Draco tries to expose the abuser. He might gather evidence secretly and present it to the right authorities at Hogwarts.
One possible plot development could be that Harry initially struggles with having Snape under his 'command' in some way. Since they had a very strained relationship in the original series, Harry might be hesitant to trust Snape even if Dumbledore has given him this new role. He could start by trying to figure out Snape's true intentions.
One plot development could be Lucius using this information to try and manipulate Harry. He might offer Harry a way out of his abusive situation in exchange for Harry's loyalty or some other form of service. For example, he could ask Harry to spy on Dumbledore for him.
In this fanfiction, it could also be that Harry's Gryffindor nature starts to rub off on Snape in some ways. They might have arguments about how things should be done, but through these interactions, Snape might start to see the value in Harry's way of thinking. And Harry, on the other hand, might learn some of Snape's more cautious and calculating ways, which could help him in his future battles.
One possible plot development is that the gods gather to hold a trial for the abuser. They would bring in witnesses, and Percy would have to testify about what happened to him. This would be a very emotional and intense scene.
Perhaps there could be a magical object or spell involved that is causing this forced marriage. Harry and Snape might have to work together to find and break this spell. Along the way, they could learn more about each other's pasts and secrets, which could change their relationship from one of enmity to something more complex.
Well, one plot development could be that Voldemort decides to use Harry's abused state to turn him against the Order of the Phoenix. He might see it as an opportunity to corrupt Harry further.
Perhaps Snape is under a spell or a magical obligation that makes him carry Harry in such an unusual way. This could lead to comical situations at first, with Harry being confused and Snape being grumpy about it. But then, they might find themselves in a magical location where they have to rely on each other. Snape's knowledge of magic and Harry's natural courage could combine to solve a mystery or defeat a foe. For example, they could be trapped in an ancient, enchanted forest, and by working together, they find a way out and also uncover a hidden power or artifact.
After the discovery, a possible plot development could be that the champion takes Harry away to a secret location to keep him safe. From there, they might try to heal Harry's emotional wounds. As they do this, they could encounter various obstacles, like the abuser trying to find them or the wizarding authorities not believing their story. The champion might then have to prove Harry's situation, which could involve finding witnesses or evidence. Another development could be that the champion's actions draw the attention of a powerful and mysterious figure in the wizarding world, who either helps or hinders their efforts to protect Harry. This could lead to a whole new set of challenges and adventures in the fanfiction.