Another plotline could be that they are all given a mysterious task by an ancient magic entity. To complete this task, they must put aside their differences. Snape and Lucius, who have a history of being on the same side but also having their own rivalries, have to work with Harry, whom they have long seen as an adversary. Draco, caught in the middle, has to choose between his family's old ways and this new alliance, which creates a lot of internal conflict and an engaging story.
In some fanfictions, there is a plot where a dark magic curse has been placed on the wizarding world that only they can break. The curse affects their magic in different ways. Harry's magic becomes unstable, Snape's occlumency is disrupted, Lucius loses some of his family's wealth - based magic advantages, and Draco's pure - blood magic is weakened. They must combine their skills and knowledge, including Snape's potions expertise and Lucius's knowledge of dark artifacts, to find a cure and in the process, form a strong bond.
Some fanfics have a plotline where Draco becomes a double agent, and Snape has to protect him while also dealing with Harry's suspicions. It creates a really tense and interesting dynamic between the three.
One interesting fanfiction could be 'The Unlikely Bonds'. In this story, it explores how their relationships develop in a way that defies the typical animosity shown in the original series. It shows Harry, Snape, Lucius and Draco coming together due to a common threat to the wizarding world. They start to understand each other's motives and gradually form a sort of alliance, which eventually turns into an unexpected friendship.
One unique plotline is when Harry and Draco are magically bound to protect each other's families. It forces them to work together and Hermione is the mediator. They have to overcome their past enmity for the sake of their loved ones.
One idea could be a story where they are forced to work together on a dangerous mission for the wizarding world. They start off distrusting each other but gradually come to respect one another as mates. Harry's courage, Snape's cunning, and Lucius's ambition could combine in interesting ways to overcome the challenges.
One great 'Harry and Snape mates' fanfiction is 'The Unlikely Bond'. It shows how they gradually overcome their differences and form a deep friendship. Another is 'A New Understanding' which delves into their shared experiences that lead to their friendship. And 'The Bond Beyond House Rivalry' is also interesting as it explores how they work together despite being from different Hogwarts houses.
In some fanfictions, their plotlines might involve them working against a common enemy within the wizarding world that is not Voldemort. For example, they could be trying to expose a corrupt Ministry official who is trying to undermine the Slytherin house or all pure - blood families. They might also have a plotline where they are forced to trust each other after being framed for a crime they didn't commit and have to work together to clear their names.
One possible plotline is that they are all framed for a crime they didn't commit. To clear their names, they must team up. Harry's quick thinking, Snape's ability to deceive when needed, and Lucius's connections all play a part. As they work together to find the real culprit, they form a bond of mutual trust and respect, which is the foundation of their new - found mate - ship.
One popular one could be 'The Triad Bond' where it explores their unique relationship dynamics. It delves into how they come to terms with being mates and the challenges they face within the Hogwarts environment.
One common plotline is a time - travel scenario. Hermione might go back in time and interact with a younger Snape, Lucius, and the others. This could lead to her trying to change the future, like preventing Draco from following in his father's dark footsteps. Another plotline could be a magical mystery where they all have to work together. For example, a powerful dark magic object is discovered, and Hermione teams up with Draco, Blaise, and Theo, while Snape and Lucius are reluctantly involved too. And there's also the plotline of a secret society where they are all members, with Hermione bringing a different ideology that challenges the pure - blood - centric views of some of the others.
There are many Lucius Draco fanfictions that play with the idea of alternate universes. For example, in some he might be a hero instead of a villain. There are also those that focus on his magical abilities and how he could have developed them further. Fanfictions might also explore his political ambitions within the wizarding world, whether it's in relation to the Ministry of Magic or within the pure - blood community.