One idea could be that Eddie's OC is a long - lost relative who comes to the House of Anubis with a mysterious mission. Maybe they are searching for a hidden artifact that has a connection to the Anubis legend. This could lead to all sorts of adventures and interactions with the other characters, especially Eddie.
The plot could involve KT and Eddie being drawn to each other while exploring the mysteries of the House of Anubis. Their kiss might be a spontaneous act during a discovery. For instance, they find a hidden room and the excitement of the moment leads to a kiss.
A possible plot could be that they are paired up for a school project related to the secrets of the House of Anubis. As they research together, they start to see each other in a new light. One day, while exploring a hidden part of the house, they get a bit scared and in that moment of vulnerability, they share a kiss.
You can develop Eddie by showing his relationships with the OC. For example, if the OC is a bit of an outcast, Eddie could be the one to befriend them and show them the ropes at the House of Anubis. This would show his kind and helpful side.
In many fanfictions, the Nina and Eddie kiss can be seen as a culmination of their character arcs. Eddie might have been secretly longing for Nina for a while, and the kiss is the manifestation of his feelings. Nina, on the other hand, could be realizing her true feelings for Eddie at that moment. This kiss can also be a plot device to drive the story forward, for example, causing jealousy among other characters or leading to new conflicts.
Maybe the pregnancy is part of some ancient prophecy related to the mysteries of the House of Anubis. Nina and Eddie initially struggle to understand how this could be possible. They embark on a journey to find out more about the significance of the pregnancy, all while trying to keep it a secret from the wrong people who might want to use the situation for their own gain.
One possibility for such a fanfiction could be that KT and Eddie's kiss is a moment of realization for both of them. Maybe they've been friends for a while, but this kiss suddenly makes them see their feelings in a new light. It could be a soft, gentle kiss that takes place in the secret passages of the House of Anubis, with the mystery of the place adding to the allure of the moment.
There could be many different takes on this fanfiction. Maybe it starts with a build - up of their relationship. They might have been through some adventures in the House of Anubis together, and as they grow closer, the kiss becomes a natural progression of their feelings. It could be a sweet moment filled with hesitation at first, and then a rush of emotions.
The specialness might also come from the unique personalities of Nina and Eddie in the context of the House of Anubis world. Their different backgrounds and character traits coming together in that one kiss can be really interesting. For example, if Eddie is the more adventurous one and Nina is more cautious, the kiss could be a moment of their two worlds colliding in a beautiful way.
A fanfiction could focus on a new student arriving at the House of Anubis who has a special power related to the ancient Egyptian magic in the house. For example, they can communicate with the spirits that are often associated with the mysteries there. This would change the dynamics as the other students have to figure out if this new student is a help or a hindrance.
One idea could be to explore a new mystery in the House of Anubis. Maybe a hidden chamber is discovered that has ancient artifacts and secrets related to Anubis. Another could be to have a character develop a new power or ability that is connected to the Anubis mythology. For example, they can communicate with spirits in the house that hold important information about the past.