Well, perhaps the plot could involve how Joy's pregnancy affects the other emotions in Riley's head. For example, Sadness might be extra worried and trying to be more helpful. Fear could be constantly on edge about the new situation.
In this fanfiction plot, Joy's pregnancy could be a symbol of a new stage in Riley's life. Maybe Riley is about to go through a big change like starting high school or moving to a new city. The pregnancy of Joy then represents the new possibilities and emotions that come with this change. The other emotions work together with Joy to prepare for this new phase. They have to deal with their own insecurities and also support Joy. There could be a lot of internal conflict as they try to figure out how to handle the situation, but in the end, they all grow and become stronger as a result of this unique experience.
Perhaps in the fanfiction, there's a competition among the emotions. Joy and Disgust form an unlikely alliance to win. They decide to focus on making Riley more confident in her own unique tastes. So they work on getting her to embrace her individuality without being too self - conscious. This would involve Joy's positive outlook and Disgust's sense of what's appropriate for Riley.
The fanfic might be about a situation where Joy and Sadness accidentally swap their functions for a while. This causes chaos in Riley's emotions as they try to adapt to their new roles. As they struggle, they develop a deeper bond and a newfound respect for what the other does.
One idea could be a story where Joy and Disgust have to team up to help Riley through a new and strange situation. Maybe Riley has to eat a very unusual food for a school project. Disgust is initially against it, but Joy tries to find the positive side and together they encourage Riley to give it a try, leading to a new experience for her.
In a fanfiction, Joy and Fear could have a very interesting relationship. Maybe they start to understand each other better. For example, Fear could show Joy that being cautious sometimes is a good thing, and Joy could teach Fear that there is always something positive to look forward to even in scary situations.
A fanfic about Joy and Anger in Inside Out could explore their relationship in different scenarios. Maybe it could show how they interact during Riley's tough times. For example, when Riley is feeling sad about moving, Joy might try to cheer her up while Anger could be frustrated at the situation. They might have arguments about the best way to handle Riley's emotions.
Perhaps there's a glitch in Baymax's system that causes him to project Riley's emotions as holograms. Hiro is confused at first but then realizes that these emotions are from someone else. They track the source of the connection and end up in Riley's mind. There, they find that the emotions are in chaos because of the sudden link to Baymax. The Big Hero 6 characters use their skills to help the Inside Out characters restore order. Hiro and Baymax help Joy understand how to better manage the positive emotions while the rest of the team helps the other emotions like Sadness not feel so left out or misunderstood.
In a 'Big Hero 6' and 'Inside Out' crossover fanfiction, perhaps Riley visits San Fransokyo. During her visit, she witnesses an accident that Big Hero 6 is responding to. The chaos and destruction make Sadness start to surface strongly in her. Baymax senses her distress and tries to help her. This leads to the team inviting Riley to their lab to cheer her up. Inside their lab, the emotions are fascinated by all the high - tech gadgets and start interacting with them, causing some comical and unexpected situations as they blend the two very different worlds of technology and emotions.
When writing an Inside Out Joy x Fear fanfiction, focus on their character arcs. Create a plot that challenges both of them. For instance, Riley is about to do something that she's never done before, like giving a big speech. Joy is all excited and wants to rush in, but Fear holds her back. This conflict can be the starting point of their journey. As they interact more, show their internal struggles. Joy might be afraid of losing her positive influence if she listens to Fear too much, and Fear might be afraid of being pushed aside by Joy. By exploring these complex emotions, you can create a rich and engaging fanfiction.
I'm not sure of a specific 'Inside Out' fanfiction with this theme. But you could try searching on fanfiction websites like Archive of Our Own. Just type in 'Inside Out Joy pregnant' in the search bar, and see what comes up.
Another idea is that there is a new emotion that enters Riley's mind and it seems to be a threat to both Joy and Sadness. They have to team up to figure out what this new emotion is and how to deal with it. Along the way, they discover new sides of each other and strengthen their bond.