Well, it could be for Lucius to spy on Draco's friends or to manipulate situations in Draco's favor without revealing his own involvement. Authors come up with all kinds of reasons to make the story more interesting.
A 'Lucius gives birth to Draco fanfiction' might be quite complex. It could start with some sort of magical experiment or curse that affects Lucius. The fanfiction could then focus on the emotional journey of Lucius during the pregnancy, his relationship with Narcissa during this strange time, and how Draco's birth changes their family dynamics. It might also explore how the wizarding society reacts to such an unheard - of event.
The children could look really interesting. Imagine a child with Draco's platinum blond hair at the roots that fades into a reddish - blond towards the ends, like a magical blend of their parents' hair colors. Their skin might be fair but with a bit of a rosy tint from Ginny's side. Their eyes could be a deep hazel, showing a combination of the mystery in Draco's eyes and the brightness in Ginny's. In terms of build, they might be slender yet strong, with long fingers for spell - casting, a trait perhaps passed down from both families who have a history of powerful magic - users.
Harry Potter can be an interesting character to pair with them. It creates a lot of conflict and potential for character development. Given their opposing stances in the original story, it can lead to some really intense and thought - provoking scenarios in fanfiction.
Their wedding ceremony would likely be a blend of wizarding and muggle traditions. There would probably be a beautiful outdoor setting, perhaps in a wizard - protected garden. Hermione would likely wear a white dress with some magical elements, like a shimmering veil that has a charm on it. Draco would be in a smart suit, perhaps with a Slytherin - themed cravat. The ceremony would be officiated by a wizard, but they might also include some muggle elements like exchanging rings in the traditional way. There would be floating candles and magical flowers all around.
Hermione Granger is quite common. Since she's very intelligent and resourceful in the original series, in fanfiction she often uses the Polyjuice Potion for various purposes, like solving mysteries or getting access to restricted areas.
They could start by having an honest conversation. Lucius needs to admit his wrongdoings and Draco needs to express his pain. It's a first step towards redemption.
Draco. He's younger and more agile. He might have learned some new spells at Hogwarts that Lucius isn't familiar with, giving him an edge in a physical fight.
Draco might immediately become defensive. He would probably try to shield Hermione from his father's wrath at first. He could also be filled with fear, knowing how strict and unforgiving his father can be.
If Lucius walks in, the power dynamic between Harry and Draco would likely shift. They would no longer be in their own little world and would have to deal with an adult authority figure. Draco might become more submissive to his father's commands, and Harry would have to face the wrath of Lucius, which could put him in a very difficult situation.
It would be really complex. Draco would probably be initially very confused and maybe a bit resentful. He's been brought up with certain ideas about pure - blood superiority and Hermione being a 'Muggle - born' (in the original context). Now, if she's his aunt, he'd have to re - evaluate his views. He might also be jealous of Hermione's intelligence and the fact that she doesn't conform to the Malfoy family's more rigid ways.