One possible scenario could be that they share a kiss during a moment of high emotion on stage. Maybe they are performing a duet and get so caught up in the moment that their feelings overflow and they kiss.
Many fans write the relationship with a focus on the emotional depth. The kiss is not just a physical act but a culmination of all the unspoken emotions they've had for each other. They might describe in detail how Tori and Cat feel in that moment, the butterflies in their stomachs, the racing of their hearts, and how this one kiss changes the whole dynamic of their relationship.
One common theme is friendship. Since Tori and Cat are friends in the show, many fanfictions expand on their bond. They might write about how they support each other through school or personal problems.
One possible plotline could be that they are rehearsing for a school play and during a particularly emotional scene, they share an unexpected kiss. This kiss then makes them both realize their hidden feelings for each other.
There are many places to find 'Victorious Tori x Cat' fanfiction. Fanfiction.net is a great start. You can search for the specific pairing there and might discover various stories written by different authors, each with their own take on the relationship between Tori and Cat.
Finding specific fanfiction like Tori and Andre kiss stories can be a bit of a hunt. You could also look at Archive of Our Own (AO3). It has a large collection of fanfiction. Use the tags to narrow down your search. Look for tags related to Victorious, Tori, Andre, and kissing. Some stories might be really well - written with great character development leading up to the kiss, while others might focus more on the romantic moment itself.
In a fanfiction, Tori and Beck could be pregnant as a result of a magical or otherworldly event. For example, a strange spell is cast on them that causes Tori to become pregnant. This would add an element of mystery and the need to find a way to reverse the spell, all while dealing with the fact that they are now in this unexpected situation.
Finding such fanfiction can be a bit tricky. Usually, these types of fan - made stories are quite niche. You might have to dig deep into the search filters on fanfiction platforms. Maybe start by searching for 'Victorious' fanfiction and then look for ones that involve Tori in a pregnancy - related storyline within the search results.
It could be a comical kiss. Given the nature of Victorious, there might be some misunderstandings before the kiss. Like Robbie thinks it's part of a play or something, and Cat just goes for it without really thinking. And then they both get all flustered and embarrassed afterwards, which would be really funny to read about.
One possible plot could be that Cat and Beck are cast in a play together where they have to play romantic interests. As they rehearse their kissing scenes, they start to develop real feelings for each other off - stage. Their friends initially tease them but then start to see how much they truly care for one another.