In fanfiction, the author often has the creative freedom to play with the rules. So, it could be that there is a new form of magic introduced that is unique to the Azkaban setting in this story. This new magic might have affected Harry in such a way that he becomes pregnant. It could also be related to the strange and often malevolent energy that surrounds Azkaban, which has some sort of mutagenic effect on him.
Well, in some fanfictions, it might be justified by a complex backstory. Maybe Voldemort realizes that Harry has some power or knowledge that could be useful to him in a different way than just killing him. So, instead of harming Harry, he decides to heal him to gain an advantage.
Harry might survive in Azkaban because of his connection to his friends, even if they betrayed him. Their memories could give him the strength to hold on. And he may be able to use his magic in unique ways. He could draw on the positive emotions he has left, like his love for his parents, to create a shield against the Dementors. Plus, he may be constantly looking for a way to prove his innocence and that hope could keep him alive.
Well, in this fanfiction, it could start with Harry and Daphne having a secret relationship. Then, when Daphne discovers she's pregnant, there could be a lot of drama. Maybe Harry is in the middle of some important wizarding mission or dealing with his own personal issues. They would need to figure out how to balance their new situation with all the other things going on in their lives. It could also lead to some interesting character growth for both of them as they step into new roles as future parents.
In the fanfiction, it could be that Daphne has some unique magical ability that she uses to protect Harry in Azkaban. They might encounter other inmates who are actually innocent too and together they start a mini - revolution against the unjust system of Azkaban. Harry, with his experience of facing Voldemort, might lead the way in finding a way out of the prison.
One possible plot could be that Harry and Ginny are wrongly accused and sent to Azkaban. They then have to find a way to prove their innocence while dealing with the dark and dreary environment of the prison. They might discover a conspiracy within Azkaban that is related to the real culprits they are being framed for.
In the 'harry locked in azkaban fanfiction', it's possible that Voldemort has a hand in getting Harry locked up in Azkaban. Harry, being the strong - willed wizard he is, tries to communicate with the other inmates to find out if there are any clues related to Voldemort's new plot. He also has to deal with the harsh conditions of Azkaban, like the cold and the constant threat of the Dementors sucking out his soul. But he doesn't lose hope and keeps looking for a way to escape and save the wizarding world from whatever danger Voldemort is planning.
Hermione would probably be shocked at first. But then she would try to find a way to help Harry through it, using her vast knowledge of magic to figure out what's going on.
He might use the invisibility cloak. Harry could sneak into Azkaban unnoticed and then use magic to break Draco out of his cell. The cloak has served him well in the past, and it would be a simple yet effective way to get past the guards.
A possible plot in a Medusa pregnant fanfiction could be that she discovers she's pregnant after a strange encounter. Maybe she was cursed and the pregnancy is part of the curse, or it could be a result of a new - found love. This discovery could set her on a journey to find a way to either keep the baby safe or break the curse if it is one.
Maybe he uses some powerful magic spells that he has learned secretly. For example, the Patronus charm could be used to fend off the Dementors which are the main guards in Azkaban. He might also get some unexpected help from his friends or some mysterious characters within the fanfiction world.