I'm not sure if there is a specific 'bellatrix delivers hermione baby' fanfiction. There are so many fanfictions out there that it's hard to say for certain. You could try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net to see if it exists.
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.
In fanfiction, the idea of Hermione and Bellatrix having a baby is a very unique and often dark concept. It might explore how the two very different characters' traits could be combined in a child. Maybe the baby would inherit Hermione's intelligence and Bellatrix's fierce determination in some strange way. However, this is all in the realm of creative fanfiction and not part of the original canon.
It could entail a story where the baby has extraordinary magical abilities due to the unique combination of Hermione's natural talent and Bellatrix's dark magic knowledge. For example, the baby might be able to perform spells that are a blend of light and dark magic.
Since it's a fanfiction, it could be set in the world of an existing story or show. Maybe Gilbert is a character who has no medical training but has to step up and deliver a baby. It could also involve other characters from the original source, like his friends or family helping him through this nerve - wracking situation.
The husband and wife are key. The husband is the one doing the delivering. There might also be a midwife character who was supposed to be there but got held up, so the husband has no choice but to step in. And of course, the new - born baby is also an important character in the end.
In this kind of fanfiction, the plot could involve the husband having studied some basic medical knowledge before. So when the unexpected situation of delivering the baby at home arises, he uses that knowledge. He may also have some superhuman determination to keep his wife and the new - born safe, adding a touch of heroism to the story.
Gilbert is the key figure here, but we can assume there will be other characters to support the story. There could be a panicked father waiting outside, or a helpful neighbor who brings in supplies while Gilbert is trying to deliver the baby. The mother, of course, is a crucial character as she is going through the labor process. And depending on the context of the fanfiction, there might be some sort of antagonist, like a natural disaster or a lack of proper medical equipment that Gilbert has to overcome.
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.