In this fanfiction, Merlin could have sensed the danger beforehand. Since he has magic, he might have some sort of premonition ability. So he could have prepared some magical defenses around Arthur. For example, he could have cast a spell that makes Arthur invisible to the assassins, or a protective shield that deflects any attacks aimed at him.
Merlin might have used his knowledge of the castle's secret passages. He could lead Arthur through those passages, away from the assassins. Also, Merlin could have called upon some magical creatures he's befriended, like the dragon, to help him. The dragon could fly in and either scare the assassins or carry Arthur to safety.
Another way Merlin could save Arthur is by disguising himself as Arthur. Since he has magic, he could easily change his appearance. He'd then draw the assassins away from the real Arthur. Merlin would be putting himself in great danger, but his loyalty to Arthur would make him willing to take that risk. He could then use his magic to fend off the assassins once they realize they've been tricked.
Merlin could be heartbroken. He might retreat into himself and become more withdrawn. After all, he has a deep bond with Arthur, and this sudden break - up would be a huge shock.
Merlin would be very worried. He would probably stay by Arthur's side day and night, using his magic secretly to try and heal him. He might also search for rare herbs or magical items that could cure Arthur.
The banter between Merlin and Arthur in fanfiction is really interesting. It can range from light - hearted jabs at each other's habits. Merlin might poke fun at Arthur's love for jousting and how he always gets a bit too competitive. Arthur could retort by mentioning Merlin's clumsy attempts at serving him. Their banter also reflects the underlying respect they have for each other despite their different social standings. It's like a friendly sparring that keeps their relationship dynamic.
In Merlin fanfiction, Merlin calls Arthur sire as a sign of respect. In the Arthurian legend and related fictional settings, sire is a term used to address a nobleman or a person of higher status. Merlin, being Arthur's servant and advisor in many versions, uses this term to show his loyalty and deference to Arthur's position as king or prince.
Merlin would likely be seen as a bit of an enigma at Hogwarts. His magic is different from the norm, so he might be a bit of an outsider at first. But his kind heart and loyalty would soon win over his classmates. Arthur would be the brave and headstrong character, perhaps a bit like a Gryffindor version of his usual self. He'd be eager to learn about combat magic and would probably be a natural leader in group projects or Quidditch teams.
During the time of Merlin's captivity, they could have long conversations that they never had before. Arthur might open up about his insecurities regarding magic and his kingdom, and Merlin could share his true feelings about serving Arthur. This would strengthen their bond in a new and unexpected way.
It could start with a slow realization of their feelings. Maybe they were friends for a long time and then suddenly, one day, they look at each other in a new light. After getting married, they become more protective of each other. Arthur might become more open to Merlin's magic, and Merlin would be more involved in Arthur's political decisions.
It completely changes the dynamic. Instead of just a friendship, it adds a layer of romantic love. Their interactions now have a different undertone. For example, a simple glance between them in the original story might just be friendly, but in the fanfiction, it could be filled with passion and love.
In the fanfiction, their relationship may develop gradually over a series of events. At first, they might have a bit of a rocky start, with Arthur being a bit oblivious to Merlin's true worth. But as they face challenges like political intrigue in the court, battles against dark magic, and helping the common people, they start to understand each other on a much deeper level. Merlin's selfless acts of using his magic for Arthur and the kingdom, and Arthur's growing respect for Merlin's abilities and character, all contribute to a relationship that blossoms into love. And this love is what leads Arthur to consider proposing to Merlin.