Power struggle within the family. Lucius may see Draco as a threat to his own position in the family or in the wizarding community as Draco grows older. Beating him could be a way to keep him in line and maintain his own authority.
It could be out of disappointment. If Draco fails to meet Lucius's high expectations in terms of upholding the family's pure - blood status or in his performance at Hogwarts, Lucius might resort to violence as a form of punishment.
One possible motive could be to create an emotional shock for Harry. It makes him face a difficult situation and tests his moral compass. Another motive might be to force Draco to reveal some important information, with the torturers knowing that Harry's presence would add extra pressure on Draco.
One possible motive in such a fanfiction could be to explore the darker side of the Malfoy family dynamics. It might show how power within the family can be misused. The impact on Draco could be significant, leading to his character having deep - seated insecurities and a complex personality. It could also make readers view Lucius as a more villainous figure than he already is in the original series.
Well, it could be a story of adventure. Draco and Lucius might be on a quest for a powerful magical artifact. Draco rides with Lucius on a magical carriage or a flying beast, and along the way, they face various challenges like traps set by other wizarding families or magical creatures that try to stop them.
Perhaps it's a story where Draco is learning how to fly better from his father Lucius. Lucius could be showing Draco some advanced flying techniques while they are on the broom, and during the flight, they might have a deep conversation about the family's future in the wizarding society.
One possibility is that Lucius is trying to prepare Draco for a dangerous task in the wizarding world. He believes that by starving Draco, he can make him more resilient and focused. However, this extreme method backfires as Draco starts to lose his health and his magical abilities start to wane. His friends notice the change and try to intervene, leading to a conflict between Lucius and those who want to protect Draco.
Maybe Lucius wants to use Harry for his own gain. Harry is a famous figure in the wizarding world, and Lucius could be thinking of leveraging Harry's status for something, like getting back into the good graces of the wizarding society after his fall from grace.
Perhaps it's related to their different views on the Dark Lord. Lucius is a more committed follower, while Draco may have doubts or be less eager to be involved in the dark deeds. Their conflicting loyalties could cause a rift and ultimately lead to a fight in the fanfiction.
One possibility is that they are there to retrieve some Dark Arts artifacts hidden in Grimmauld Place. Lucius believes that these artifacts can strengthen their position in Voldemort's ranks. Draco, on the other hand, is starting to question the morality of using such artifacts. As they search, they come across old memories and secrets of the Black family that make Draco wonder if the path his family has chosen is the right one. He might start to see the value in the Order of the Phoenix's fight against the Dark Arts, even if he doesn't fully support them yet.
Lucius' power within the dark wizarding world could be intimidating to Draco. He has connections, influence, and a certain level of magical ability. Draco might be scared that if he steps out of line, Lucius could use his power against him, or even put him in danger. Also, Lucius' cold and often unforgiving demeanor could make Draco feel constantly on edge in a fanfiction.
One possible plot could be that Lucius is trying to punish Draco for some disobedience or failure. Starving him could be a form of extreme discipline in a very dark and cruel Malfoy family dynamic.