After the kiss, they might face some challenges from their friends. Some friends could be jealous or think that their relationship will get in the way of their mystery - solving adventures in the House of Anubis.
They could start to secretly date. Since they are in a rather public and busy place like the House of Anubis, they would have to be very careful not to be caught by the wrong people. This secrecy could add an exciting element to their relationship in the fanfiction.
A fanfiction could depict that their kiss was part of a dream sequence at first. Nina was dreaming about Fabian and in the dream, they shared a beautiful, passionate kiss. When she woke up, she was confused but also realized her true feelings for him. Later, in real life, the same situation occurred and they actually kissed, making the dream seem like a premonition of their relationship.
They might have a mysterious encounter in the old corridors of the House of Anubis. Maybe they stumble upon a secret room while exploring together and start to piece together more of the house's mysteries.
One scenario could be that they meet in the attic. Nina is looking for some clues about the house's past, and Fabian is there by accident. They startle each other at first but then realize they both have a thirst for knowledge about the secrets of the house.
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.
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.
One possible plot twist could be that the father of Nina's baby is not who everyone initially suspects. Maybe there's a long - lost relative or a mysterious figure from the House of Anubis' past who is the real father. This would add a lot of mystery and drama to the fanfiction.
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.
One great 'nina and fabian kiss fanfiction' might be the one where they share a kiss during a moonlit adventure in the school's secret passage. It adds an element of mystery and romance.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms usually have a wide variety of fan - created stories, including those about Nina and Fabian's kiss.