One possible fanfiction could be about Bellatrix's time in Azkaban and how she coped with the Dementors. Maybe she had some hidden magic that she used to keep her sanity in that dark place. It could also explore her thoughts about Voldemort during her imprisonment and how her loyalty to him remained unshaken.
One possibility is that it could be a story of redemption for Bellatrix. Maybe Harry, in his ever - empathetic nature, tries to understand what led Bellatrix to become so evil while they are both in Azkaban. He might try to reach out to the part of her that was once good, perhaps influenced by the idea that everyone has some good in them.
One possibility is that Bellatrix would try to escape and Harry would be there to stop her. This could lead to intense magical battles within the prison walls. Harry, with his strong sense of justice, would not allow her to break free and continue to cause chaos. Meanwhile, Bellatrix, being the deranged Death Eater she is, would stop at nothing to get out and might even try to use Harry as a hostage or a bargaining chip.
A plot twist could be that the Dementors in Azkaban are not what they seem. Harry and Bellatrix find out that they are being controlled by a greater, more sinister force. This discovery makes them put aside their differences and fight together against this new threat, which is something no one would expect considering their prior relationship.
The plot could revolve around Bellatrix's memories in Azkaban. Since she was there for a long time, she might have had some extremely vivid and disturbing memories. A fanfiction could explore these memories and how they influenced her actions after she escaped. For example, she might have seen the faces of those she killed in her dreams while in Azkaban, and this could have made her more vengeful.
At first, it would likely be extremely hostile. Bellatrix would view Harry as an enemy to be destroyed, and Harry would see her as a symbol of the evil he has been fighting against. But as time goes on, if they are forced to interact, there could be a begrudging respect that develops. For example, Bellatrix might respect Harry's magical abilities that have allowed him to survive against Voldemort so many times.
There might be some out there, but it's important to note that 'lemon' fanfiction often contains inappropriate or adult - themed content which goes against the original spirit of the Harry Potter series. I would recommend looking for more positive and canon - compliant fanfictions instead.
Yes, there are some out there. However, 'lemon' in fanfiction often implies mature or inappropriate content, so you need to be cautious when looking for it. You can try searching on some specialized fanfiction websites, but make sure to abide by their rules and terms of use.
I'm not a big fan of this pairing in a romantic or 'lemon' context as it's quite an unusual and often not in line with the original spirit of the 'Harry Potter' series. However, you can try searching on some fanfiction websites like Archive of Our Own. There might be some stories there, but keep in mind that such pairings can be controversial among fans.
There might be some out there in the vast realm of fanfiction, but I wouldn't recommend seeking it out. This kind of fanfiction often violates the spirit of the original story and can be quite disturbing. The Harry Potter series has a rich and positive world - building, and such out - of - character pairings are not in line with it.