The sigil could be a symbol of trust. Arthur giving Merlin his mother's sigil might mean he truly considers Merlin as a close and trusted friend. It could also be a form of protection. In the world of fanfiction, perhaps the sigil holds some magical power that Arthur wants Merlin to have for safety.
In fanfiction, Ygraine is often a crucial figure. As the mother of Arthur and Merlin's connection to Arthur's birth, she can be a symbol of destiny. Her role might be expanded to show how her actions or even her existence influenced the fates of both Merlin and Arthur. For example, some fanfictions may explore how her death was not just an event but a catalyst for future events in their lives.
Often in fanfiction, Ygraine is a complex character. She may be portrayed as a victim of Uther's desires in one aspect, but also as a strong - willed woman. When it comes to her relationship with Merlin and Arthur, she could be the one who unknowingly weaves their fates together. For instance, her death could be the starting point of a chain of events that bring Merlin and Arthur closer, and fanfiction writers can play with this concept in many different ways.
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.
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.
The 'Redemption' trope is also seen in some fanfictions. Maybe Arthur has made some mistakes in the past, and Merlin helps him to redeem himself. Or vice versa. It's a way to explore the characters' growth and development. And then there's the 'Battle Against Evil' trope where they fight side by side against dark forces, which really showcases their bond and loyalty.
I really like 'The Sword in the Stone' as a fanfiction - like take on Merlin and Arthur. It shows Merlin as this wise and mysterious figure guiding Arthur on his journey to become king. There are also some great interactions between the two characters that show the deep bond they share. You can find it in many libraries or online bookstores.
The physical closeness of Merlin sitting on Arthur's lap can be the start of a deeper emotional connection. Arthur might become more aware of Merlin's vulnerability, which could lead to him being more open and caring towards Merlin in general. For example, he could start sharing his own insecurities with Merlin.
Well, Arthur could feel betrayed at first. He has been brought up to believe that magic is bad, and here his closest friend has been hiding this big secret. However, as he realizes how Merlin has saved his life and the kingdom many times with his magic, he might come to accept it and even see the potential of magic being used for the good of Camelot. For example, Merlin's magic has defeated many enemies secretly, which Arthur might now understand as a necessary protection for the kingdom.