A 'Harry Potter' fanfic about Voldemort and a cooking slave might start with the slave's capture or how they came to be in Voldemort's service. The slave would likely be treated very poorly, with Voldemort showing no mercy. The cooking aspect could be used to show the contrast between the normalcy of cooking (a homey, everyday activity) and the horror of being in Voldemort's presence. There could be other characters in the fanfic, like Death Eaters who interact with the slave in different ways, some might be more cruel, while others might have a bit of pity. And perhaps the slave could have some hidden power or knowledge that could eventually be used against Voldemort, leading to a potential escape or a change in the power dynamic in the story.
In this fanfic, the dinner being cooked could be a grand feast for Voldemort and his Death Eaters. The slave, perhaps a captured Hogwarts student, has to use their magic skills in cooking while also dealing with the fear of Voldemort. The description of the dark and gloomy kitchen where the cooking takes place could add to the overall atmosphere of the story.
I'm not sure if there is specifically such a 'Harry Potter' fanfic. There are countless fanfictions in the 'Harry Potter' universe, and while it's possible, it's not a common or widely - known trope that I'm aware of.
The slave could be using the cooking as a form of resistance. They might be adding ingredients that have hidden magical properties that could harm Voldemort or his followers when consumed.
It would be really strange. Maybe Harry would have a different kind of magic, something more in line with the Dark Arts. His personality might be more conflicted, since he has the blood of the most evil wizard in his veins.
It would be a very strange and dark fanfic. Harry is the hero who is supposed to defeat Voldemort, so making him Voldemort's consort completely flips the original story's dynamic.
Well, it would be a much more peaceful Hogwarts. Harry could focus on his studies and normal wizarding life without the constant threat of Voldemort. There would be no need for the Order of the Phoenix, and the Ministry of Magic could focus on other matters like improving magical education or relations with the Muggle world.
Well, 'Harry Potter slave fanfic' is something that really shouldn't exist in the fan community. It's likely a perversion of the original story. In the proper 'Harry Potter' world, there are themes of friendship, courage, and fighting against oppression. But this 'slave fanfic' thing probably twists those characters into situations that are completely out of character and morally wrong. For example, making a character a slave is just wrong and disrespectful to the original creation.
In such a fanfic, Harry might be tortured for information about the Order of the Phoenix. Voldemort could try to turn Harry to the dark side, using his powerful magic to break Harry's will.
Well, in a fanfic where Harry joins Voldemort, it could be a very different story. Harry could start to learn the dark arts from Voldemort, which would change his character completely. He might be given new powers or abilities that are dark in nature. This would also cause a lot of confusion among the wizarding community. People who once looked up to Harry would be disappointed and afraid. And there would be a new dynamic between the Death Eaters and Harry, with some perhaps being jealous of the attention he gets from Voldemort while others might try to befriend him for their own gain.
There are some out there. Some fanfictions in this theme might explore the dark and complex relationship between Harry Potter and Voldemort in the context of slavery. However, not all of them are well - written. You can start your search on some popular fanfiction websites like FanFiction.net or Archive of Our Own.