Another plot development could be the reaction of the wizarding community. When they find out that Harry and Voldemort are mates, there would be chaos. Some might think that Harry has been turned to the dark side. His friends, like Hermione and Ron, would be deeply confused and might even feel betrayed at first. They would have to decide whether to trust Harry's judgment or oppose him, which could lead to a great rift in their friendship.
Harry's character could also become more isolated. His new relationship with Voldemort is not something that the wizarding world would easily accept. So he might find himself alone, with only a few people, if any, who are willing to support him. This isolation could make him more introspective, and he might start to rely more on his own judgment rather than the opinions of others.
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.
One interesting plot development could be how Harry's relationship with the wizarding world changes. Knowing Sirius is his father might make him feel more confident and entitled to certain things. He might demand more answers from Dumbledore about his family's past and the secrets that were kept from him. Another aspect could be his relationship with the Weasleys. It might become a bit strained as he realizes his true lineage and starts to see himself in a different light, perhaps more of a pure - blood heir in his own mind, which could contrast with the Weasleys' more humble status.
Yes, there are some fan fictions that explore a romantic relationship between Voldemort and Harry. However, this is a very unconventional and often controversial concept within the Harry Potter fandom, as Voldemort is the main antagonist and his actions are extremely evil in the original story.
Harry might become more conflicted. He has Voldemort as a sort of father figure, but he also has his own sense of right and wrong. So he could be constantly struggling between the dark path Voldemort wants him to take and his own moral compass.
One possible plot development could be that Harry embarks on a journey to find his real family. He might start by looking into any clues he can find in his adoptive family's belongings or memories. Another could be that he faces a lot of internal conflict. He has grown up in a certain environment and now has to come to terms with the fact that it was all based on a lie. He may also have to deal with the reactions of his friends, some of whom might not believe him at first.
Well, perhaps Harry initially struggles with his new - found interest. He might be conflicted because of the long - standing rivalry between his friends and the Malfoys. But then he could start to see Draco in a new light, leading to some awkward and yet interesting encounters between them as he tries to reconcile his feelings with the reality of their families' differences.
One interesting plot development could be how Harry deals with the reactions of his friends. For example, Hermione might be initially shocked but then become very supportive, using her vast knowledge to research about this unprecedented situation for a male wizard. Ron, on the other hand, could be more comically bewildered and struggle to come to terms with it.
The plot might go like this. Harry is adopted by Voldemort and is made to believe that the wizarding world outside is full of enemies. But as he gets older, he discovers the truth about his parents' death and Voldemort's true nature. He then has to struggle with his loyalty to Voldemort who raised him and his sense of justice. He could use his unique position to gather intelligence about Voldemort's plans and eventually turn against him to save the wizarding world.
A possible plot could be that Voldemort has a change of heart (maybe due to some ancient magic or prophecy) and realizes he needs Harry and Severus. Harry, on the other hand, sees an opportunity to end the cycle of violence. Severus, with his knowledge of both dark and light magic, helps them understand each other. They could then embark on a journey to unite the wizarding world, facing challenges like the resistance from the Death Eaters who don't want Voldemort to change, and the mistrust from the Order of the Phoenix who are skeptical of Harry's new alliance. Along the way, they also discover new magical abilities within themselves and each other, which helps them in their quest.