One plot idea could be a magical accident that causes Hermione to take on Bellatrix's appearance. She then has to deal with the reactions of her friends and foes alike. For example, the Death Eaters might mistake her for Bellatrix at first and she could use this to her advantage to gather information. Another idea is that it's a curse placed on her by a dark wizard who wants to cause chaos in the wizarding world. Hermione would then have to find a way to break the curse while looking like Bellatrix.
With Harry and Ron, their initial reaction would probably be shock. They might have a hard time trusting her at first, but as they realize it's still Hermione inside, they would come around. However, they would also be worried about how others would perceive her. As for Draco, he might be more afraid of her initially, given Bellatrix's reputation. But if Hermione showed her true self through her actions, he could start to see her in a different light.
In Hermione and Bellatrix fanfiction, the power dynamic is often an interesting point. Bellatrix has a great deal of power as a Death Eater, but Hermione has her own kind of power in her knowledge and magic skills. Some fanfictions may show a battle of wills between them, where Hermione refuses to be intimidated by Bellatrix's threats. This can lead to some really intense and exciting storylines, like when Hermione stands up to Bellatrix in a duel - like situation in a magically - created arena within the fanfic's plot.
One possible aspect of Hermione and Bellatrix fanfiction could be the exploration of their opposing natures. Hermione is a studious, rule - following Gryffindor, while Bellatrix is a wild and chaotic Death Eater. Fanfiction might play with the idea of how they interact in different scenarios. For example, in a scenario where Hermione is captured by Bellatrix, their exchanges could be filled with tension and power plays. Hermione's intelligence could be pitted against Bellatrix's brute force and loyalty to Voldemort.
Yes, there are likely fanfictions out there with such a plot. The 'Harry Potter' fandom is vast and diverse, and some fanfiction authors explore dark and alternate storylines. However, these often deviate from the original positive and heroic themes of the series.
It would be very strange and likely a very dark fanfiction. Bellatrix is a Death Eater and Hermione is a good - hearted Gryffindor. The idea of Bellatrix being involved in delivering Hermione's baby goes against their normal character dynamics. It might involve a very convoluted plot where some sort of dark magic or forced situation has led to this scenario.
Living with Bellatrix would be a terrifying experience for Hermione. However, she would rely on her wits. She would probably keep her Gryffindor courage in check and act more like a Slytherin, being cunning and sly. She might start to understand Bellatrix's insecurities and use them to her benefit. For instance, if Bellatrix is insecure about her standing among the Death Eaters, Hermione could offer advice that seems helpful but actually undermines Bellatrix's loyalty to Voldemort. And she would constantly be on the lookout for any signs of kindness or humanity in Bellatrix, hoping to use it as a way to change the situation.
It would be very dark. Hermione would probably struggle with her identity, having a Death Eater mother. There would be a lot of internal conflict as she tries to reconcile her own values with her mother's evil ways.
One reason could be pure hatred. Bellatrix despises Muggle - borns, and Hermione being a very intelligent and powerful Muggle - born would be a prime target for her wrath. Another could be jealousy. Hermione's skills and knowledge might make Bellatrix feel inferior, leading her to lash out.
At first, Hermione would probably be in shock and defiance. But she'd quickly start to strategize. She'd use her vast knowledge of magic to protect herself from Bellatrix's potential outbursts.