They use the setting to build tension. Imagine a dark, secluded corner of Hogwarts where they start their fight. The mystery and secrecy of the location add to the overall mood. As they argue, the echoing of their voices in the empty corridor makes it seem more intense. Also, the authors play with the characters' emotions. Draco might be secretly in love with Hermione but is too proud to admit it, and Hermione might be attracted to Draco despite her better judgment. So, when they fight, these underlying emotions are boiling beneath the surface, creating a palpable tension that can easily lead to a more passionate encounter.
One way is through the use of internal monologues. The author might show Draco's inner turmoil as he fights with Hermione. He's thinking about how much he cares for her even as he says mean things. And Hermione is also having her own internal battle. This internal conflict adds to the external tension of their fight. Another method is by having interruptions during the fight. Maybe a fellow Hogwarts student walks by, and they have to pause their fight. This interruption makes the tension build even more as they are forced to hold back their emotions for a moment, and when they resume, it's even more explosive and can lead to the sexual tension and encounter.
One popular plot could be that they fight over a misunderstanding in their relationship. For example, Hermione might think Draco is still involved with some of his old pure - blooded ways that she doesn't approve of. Then, as they argue, the passion spills over into a more physical encounter. Another plot could be related to their work. Maybe they are working on a project together and they have different ideas on how to approach it. Their fight about the project then leads to a moment of intense connection. A third type of plot could be jealousy - based. Draco sees Hermione with another guy and they get into a huge fight which ultimately ends in them expressing their real feelings for each other in a more passionate way.
They often use the element of surprise. By having the accidental situation occur suddenly, it creates immediate tension. For example, a character might accidentally walk in on another changing, and that unexpected moment builds tension. Another way is through the characters' internal conflict. They might be shocked or hesitant about the accidental sexual situation, and this inner turmoil adds to the tension.
They build tension by being unexpected. When you least expect it, you hear those footsteps, and it immediately grabs your attention and makes you feel on edge.
They might use pacing. Slow build - up, like gradually revealing strange events or details. For example, first a small, unexplained sound, then a shadow moving slowly, building up the tension bit by bit.
Authors often use physical proximity. For instance, when the two friends are forced to share a small space like a tent during a camping trip. Another way is through lingering glances. When their eyes meet and hold for a little too long, it creates sexual tension.
Another way is by showing the desperation of the characters trying to rescue the kidnapped one. If they face numerous obstacles like powerful enemies or difficult terrains, it adds to the tension. For instance, if the Cullens have to fight through an army of new vampires to reach the kidnapped character, the readers will be worried about their success.
Authors create tension by showing the villain's near - successes. When the villain is almost about to achieve their evil goal, like taking over the world or destroying the hero, it makes the readers nervous. For example, if a villain is just one step away from activating a doomsday device, the readers will be on the edge of their seats. Another way is by making the heroes' situation seem dire. If the heroes are outnumbered or outmatched by the villain's forces, it creates tension as the readers wonder how they will overcome the odds.
By introducing dangerous enemies. In these fanfictions, there could be new, more menacing villains than in the original series. The threat these villains pose to Harry and Hermione, and their plans, keeps the readers on the edge of their seats.
Another way is by creating a sense of helplessness. The writers might show Percy's friends being unable to reach him in time or not having the power to stop the danger. This adds to the tension. And they use foreshadowing. Maybe there are small hints earlier in the fanfiction that something bad is going to happen to Percy. So when the near - death scene arrives, it feels even more intense. For instance, there could be a strange omen or a prophetic dream that was mentioned before.
You can build tension by creating time pressure for the characters or introducing unexpected obstacles.