The story could develop with Harry being held in a dark and enchanted prison. His friends would then start a search, following any clues they can find. Voldemort might taunt Harry during his captivity, trying to break his spirit.
In fanfiction, if Harry is captured by Voldemort, the development of the story would be full of twists and turns. Voldemort would likely isolate Harry, cutting him off from his magical power sources if possible. Harry, though, is a resourceful character. He might start to learn more about Voldemort's weaknesses from the inside. His friends, Hermione and Ron, would be rallying the wizarding community to mount a rescue. There could be a lot of internal conflict within the wizarding world as some might be too afraid to oppose Voldemort directly. The story could also explore the backstories of some of Voldemort's followers and how they react to Harry's capture. Some might see it as an opportunity to gain more power, while others might start to have second thoughts about following Voldemort.
In such a fanfiction, Harry would grow in his understanding of the dark side of magic. Being captured by Voldemort means being exposed to the darkest and most malevolent forms of magic. This would make him more cautious in his own use of magic, but also more knowledgeable about how to counter dark magic. His character would also become more patient. He can't rush into things as he is in a very dangerous situation. He has to bide his time, wait for the right moment to escape or fight back. This new - found patience would be a valuable asset in his future battles against Voldemort. Moreover, he would develop a stronger sense of self - identity. He would be constantly reminded of who he is and what he stands for in the face of Voldemort's attempts to break him.
Another way it could end is with a bittersweet conclusion. Harry may sacrifice something, like a part of his magic or a relationship, in order to stop Voldemort from achieving his ultimate goal. This could be a more complex and thought - provoking ending, showing the cost of victory in the face of such great evil.
In this fanfiction, the relationship between Harry and Voldemort would be full of contradictions. Voldemort adopts Harry for his own purposes, but Harry has his own will. In the beginning, Harry may be forced to follow Voldemort's orders out of fear. As time passes, he might start to question Voldemort's actions and ideology. Voldemort, seeing Harry's growing independence, could become more controlling. This could lead to a cycle of rebellion and suppression in their relationship. Harry may also find some common ground with Voldemort in their shared loneliness or desire for power, which would add more layers to their complex relationship.
First of all, Voldemort would probably be gloating over his capture of Harry. Harry's friends would then start to search for him. Hermione might use her vast knowledge of magic and research to figure out where Voldemort could be hiding Harry. Ron would be the more impulsive one, wanting to rush in and save Harry right away. As the story progresses, there could be a final showdown between Harry and Voldemort where Harry, despite being kidnapped, manages to turn the tables on Voldemort.
The story would likely take a very dark turn. Harry would lose a lot of his freedom. He might be locked up when Voldemort doesn't need him around.
At first, Harry would probably be extremely confused and distrustful. He's been told all his life that Voldemort is the bad guy. But as Voldemort continues to protect him from the Dursleys, Harry might start to question what he knows. He could gradually become more open to listening to Voldemort's side of the story.
In such a fanfiction, Voldemort would view Harry as his possession. He'd order Harry around, thinking he can use Harry's wolf - like abilities for his own dark deeds. However, Harry would not go down without a fight. He'd constantly be trying to undermine Voldemort from within. Their relationship would be a very strange and twisted one. Harry would have to pretend to be loyal while actually hating Voldemort with every fiber of his being. And Voldemort, being so arrogant, might not realize how much of a threat Harry still is even in his wolf form until it's too late.
Harry's character would likely be a mix of confusion and determination. He'd be confused by Voldemort's teachings which go against his natural inclination towards good. But his determination to find his true self would remain. He might develop a sort of duality, acting one way around Voldemort and his followers, but secretly being someone else.
At first, it would probably be very tense. Harry would be suspicious of Voldemort's motives, and Voldemort would be cautious of Harry's potential to rebel. But as time goes on, they might develop a strange sort of understanding. Harry could start to see Voldemort as more than just a pure evil figure, and Voldemort might start to view Harry as something more than an enemy.
At first, Harry would be conflicted. He has always been against Voldemort, but now being forced to be with him would make him question his own beliefs. His character could become more cynical as he is exposed to Voldemort's dark world.