In Draco rides Harry fanfiction, a great plot could be a situation where they both get lost in an unknown and dangerous part of the magical realm. They have to put aside their differences to survive. Draco's Slytherin cunning and Harry's Gryffindor courage could complement each other. Also, a plot where they are both under a spell that makes them see the world from the other's perspective could lead to some really interesting character development and relationship changes.
In these fanfictions, at first, Draco and Harry are often at odds. However, circumstances might bring them closer. Maybe they are both wrongly accused of something and have to work together to clear their names. As they spend time together, they begin to break down the barriers between them. Draco might start to admire Harry's bravery and Harry might see the vulnerability beneath Draco's tough exterior. This gradual change in perception is what usually paves the way for a deeper relationship.
One idea could be that Harry and Draco find a magical toy that has the power to transport them to different wizarding worlds. They have to work together to find their way back home. Another could be that they both inherit a collection of enchanted toys from an old wizard, and they must figure out how to use the toys to solve a mystery in Hogwarts.
One idea could be that Harry and Draco find an abandoned magical baby and they have to work together to take care of it. This forces them to put aside their differences and learn about each other in a new way.
One idea could be a story where Harry, Draco, and Severus are forced to work together on a dangerous mission to save Hogwarts from a new dark threat. They start off distrusting each other but gradually learn to respect and rely on one another.
One idea could be a story where Draco, Harry and Hermione are forced to work together on a special magical project for the Ministry. They start off hating each other but gradually come to respect one another's skills. Another plot could involve them getting trapped in an alternate magical dimension where they have to rely on each other to find their way back. Maybe Draco has some knowledge of the dark magic that created the dimension, Harry has his Gryffindor courage to lead them through dangerous areas, and Hermione uses her vast knowledge to figure out how to break the spell that trapped them.
In some of these fanfictions, an interesting plot development could be Severus having to deal with the boys' different personalities. Harry, being brave and impulsive, while Draco is more reserved and proud. Severus has to find a way to balance their needs. For example, when it comes to their magical education, he might have to teach them in different ways. He could also have to handle the outside world's reaction to him adopting both a former 'enemy' (Harry) and a pure - blood Slytherin (Draco). Another aspect could be how the boys form a bond with each other through Severus' influence. They might start to see past their initial differences and become like brothers, which changes the whole dynamic of the wizarding world they live in.
Well, 'The Magical Rivalry Turned Alliance' in the 'harry rides draco fanfiction' genre is quite good. It begins with the classic Harry - Draco rivalry at Hogwarts. However, as they face a common threat to the wizarding world, they have to put aside their differences. The story shows how they gradually come to understand and respect each other. There's also 'The Secret Meetings' where they secretly meet to study a rare form of magic together and this leads to a whole new relationship between them.
One interesting plot idea could be Fem Harry using her angelic powers to protect Hogwarts from a new dark threat. Maybe she discovers a hidden prophecy related to her angelic nature and has to fulfill it to save the wizarding world. Another could be her befriending angels from the celestial realm who come to help her in her battles against Voldemort.
Well, perhaps in the fanfiction, there's a time - travel element. Harry goes back in time and due to some interference in the past, he ends up pregnant. Snape, being the knowledgeable wizard he is, has to help Harry figure out how to deal with it while also keeping it a secret from the rest of the wizarding community. Or it could be that a dark magic artifact curses Harry into this situation, and Snape is the only one who can break the curse, but not without some emotional and moral dilemmas along the way.
Well, perhaps Draco, in the role of Merlin, has a special connection to the magical creatures that he uses to help Harry. Harry, as Arthur, is trying to unite the different factions of the wizarding world. Draco's knowledge of magic, similar to Merlin's, allows him to create magical artifacts or spells that assist Harry in his quest for unity. And there could be a love story involved too, like Guinevere and Arthur, but in the context of the wizarding world with some other character and Harry.