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.
Sure, there is. A lot of fanfiction writers are drawn to the idea of pairing Harry Potter and Bellatrix because of the extreme contrast between them. One story I read had Bellatrix under a spell that made her forget her allegiance to Voldemort, and she ended up helping Harry. This led to a series of events where they started to see each other in a different light, and the fanfiction explored their evolving relationship in great detail.
One common theme might be the exploration of the 'forbidden' nature of their relationship, given their opposing sides in the wizarding world. Another could be the power dynamic, with Bellatrix being a powerful Death Eater and Harry having his own power. However, I must note that this is a very non - canonical and often controversial pairing.
Well, a frequent theme is the exploration of good vs. evil in a more nuanced way. Since Harry represents good and Bellatrix is a symbol of evil in the original series. Fanfictions might also focus on the idea of forbidden love, as their relationship goes against the natural order of things in the Potterverse. There could be themes of manipulation too, as Bellatrix is a master of that and how Harry could deal with it if they are in some sort of relationship.
The lemon could be a key ingredient in a potion. Bellatrix, being a dark witch, might be brewing a powerful and dangerous potion where the lemon is an unexpected but crucial part. It could have properties that interact with dark magic in an unforeseen way.
In some fanfictions, the lemon could be used as a metaphor for something in Bellatrix's life. For instance, it could represent something sour or bitter in her past that she is constantly trying to overcome while still being her menacing self in the world of Harry Potter. Writers often use such symbols to add depth to characters, and Bellatrix is a character with a lot of potential for this kind of exploration.
One great Bellatrix fanfiction is 'The Redemption of Bellatrix'. It shows a different side of her, exploring what could have happened if she had a change of heart. It's an interesting read as it delves deep into her character, adding layers that we don't often see in the original books.
Hermione could be included. She might be suspicious of Harry's interactions with Bellatrix and try to interfere or help, depending on the situation. Her intelligence could also be crucial in understanding any strange magic related to Bellatrix.
Another theme could be redemption. Although Bellatrix is a villain, some fanfictions might explore if there could be any chance of her changing or at least having a moment of self - realization in relation to Harry. It could also be about Harry trying to understand the reasons behind Bellatrix's actions. Well, fanfiction gives a lot of room for such creative interpretations. For instance, the exploration of their family ties in a different light, like how Bellatrix is related to Sirius and how that might affect her and Harry's relationship in an alternate story line.
Yes, there are many non - explicit 'Harry Potter x Bellatrix' fanfictions. Some focus on their complex relationship in a more platonic or antagonistic way. Writers explore the power dynamics and the magical world's context in which they interact.