One popular 'Charles and Erik kiss fanfiction' that I've heard of is called 'Moments of Intimacy'. It really delves deep into their relationship and has some beautifully written kissing scenes. Another way to find good ones is to join X - Men fanfiction groups on social media platforms like Facebook or Reddit. People there often share and recommend their favorite fanfictions, and you might be able to discover some hidden gems that way.
The appeal of 'Charles and Erik kiss fanfiction' lies in the relationship between the two characters. Their complex dynamic in the X - Men universe, with their different ideologies yet strong connection, makes the idea of a romantic or intimate moment between them very interesting. Fans love to explore this uncharted territory of their relationship.
In fanfiction, Erik's possessiveness of Charles might be an exaggeration of his character trait. He may have a sense of ownership over Charles due to their shared experiences, like founding the X - Men together. His possessive nature could also be a way to show his intense love or loyalty towards Charles, in a rather extreme way. He might think that Charles belongs with him more than with anyone else, whether it's in their mutant - related activities or in their personal relationship.
A fanfiction might start with Charles being seriously injured in an unexpected attack. Erik, who has always had a strong connection with Charles, is enraged at first. But then he realizes that he needs to be calm to help Charles. He takes Charles to a safe place and tries to find a way to heal him. Along the way, they face many challenges, both external threats and internal emotional struggles. As time passes, their bond becomes even stronger through this difficult experience.
Another place could be Fanfiction.net. However, the search functionality might be a bit less precise compared to AO3. But it still has a large collection of fanfictions. You may need to dig a bit deeper and use more specific keywords in your search, like 'Erik x Charles slash' which is sometimes used to denote YAOI content.
Redemption is also a theme. Sometimes Erik has done things that he regrets, and Charles is there to help him find a way back. Or vice versa, where Charles makes mistakes and Erik is the one to offer support. This theme of forgiveness and growth is quite prevalent in many Charles x Erik fanfictions.
The fan community around them is also a big factor. Fans love to share their interpretations and ideas through fanfiction. YAOI fanfiction about Erik and Charles allows for a different perspective on their relationship, and fans enjoy reading and writing about it because it gives them a chance to delve deeper into the characters and their connection, adding new layers to their relationship that might not be as obvious in the main story.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions on various topics, including ones about Charles and Erik. Just use the search function there to look for relevant stories.
One popular theme is the struggle between their different ideologies while still maintaining their love. For example, their views on mutants and how to coexist with humans can create a lot of tension and drama in the stories.
One common scenario is when other mutants show an interest in Charles. Erik gets all possessive and tries to drive them away. For example, if a new mutant joins the X - Men and starts getting too friendly with Charles, Erik will make it clear that Charles is 'his' in a way. Another scenario could be when Charles is in danger. Erik's possessiveness kicks in and he becomes overly protective, not allowing anyone else to take charge of Charles' safety.