Bellatrix could be developed in a way that the lemon has some sort of calming effect on her. Maybe it was a gift from someone she once loved, and this changes her attitude towards Harry Potter and Narcissa. Narcissa, on the other hand, might see the lemon as a symbol of hope for a different future for her family, which makes her more assertive and less subservient to Voldemort. Harry Potter could learn about their hidden sides through their interactions with the lemon.
For Bellatrix, instead of just being a crazed Death Eater, she could be shown as having a more complex relationship with the lemon - like it reminds her of a childhood memory that softens her a bit. Narcissa could be developed to be more independent and less influenced by her family's dark ways because of her connection to the lemon. And Harry Potter could be more empathetic towards them because of the lemon's influence on their personalities.
There might be a fanfiction where Harry Potter encounters Bellatrix and Narcissa in an unexpected way. For example, they could be in a situation where they need to cooperate with Harry to solve a mystery related to an ancient magic artifact. This would force them to put aside their Death Eater - Order of Phoenix differences and create a unique plot full of tension and discovery.
Her character could be developed by giving her a unique backstory. For example, she could be from a family of powerful but reclusive wizards. This would explain her different approach to magic compared to the other Hogwarts professors. She could also have a special interest in a particular branch of magic like ancient rune magic, and as the story progresses, she could teach Harry Potter about it, which would show her as a knowledgeable and patient teacher.
The Death Eaters would also have different character development. They might initially be suspicious of Harry, but as he proves his loyalty to Voldemort, they could start to accept him. Some might even see him as a potential leader in the future. Harry's development might also include changes in his magical abilities. Since he's learning from Voldemort, he could gain new and dark forms of magic. This would change his perception of himself and how others see him. His appearance might even change, becoming more gaunt or having a darker aura, which is a physical manifestation of his internal change.
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.
One common theme is loyalty. Bellatrix's loyalty to Voldemort and Narcissa's more complex loyalty to her family and sometimes self - preservation create interesting dynamics. For example, in many fanfictions, Narcissa will try to protect her family from Bellatrix's more extreme actions.
Abraxas Malfoy could be developed to have a more sympathetic backstory. For example, he was pressured into certain actions by his family but secretly wanted a different path. Harry Potter could be developed in a way that shows his growth in understanding the gray areas of the wizarding world. By interacting with the idea of Abraxas Malfoy, he realizes that not all pure - bloods were simply evil. He could learn from Abraxas' story and use it to change his views on some of the long - standing prejudices in the wizarding community.
One idea could be a story where Bellatrix and Narcissa are forced to work with Harry Potter due to some dark magic that binds them, and a lemon tree (represented by 'lemon' in a symbolic way perhaps) holds the key to breaking the spell. Another could be a tale set in an alternate universe where they all have to protect a magical lemon that has the power to save the wizarding world.
Often, in fanfictions, Bellatrix's fanatic loyalty to Voldemort clashes with Harry's role as the Boy Who Lived. She might be depicted as constantly trying to undermine or harm him. Narcissa, on the other hand, is more self - interested and her interactions with Harry can be based on self - preservation and the well - being of her family. Andromeda, having defected from the Black family's more dark - sided traditions, might support Harry in his fight against the remnants of Voldemort's forces and help him understand the Black family dynamics that still influence the wizarding world.
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.
One idea could be a time - travel fanfiction where Hermione goes back in time and has to face Bellatrix in a magical duel. Harry could be caught in the middle, trying to protect Hermione. Maybe Bellatrix has a secret that could change the course of the wizarding war, and Hermione discovers it.