One common storyline might be about how Morty's unexpected pregnancy affects his relationship with Rick. Maybe they have to deal with the reactions of their family and friends in the multiverse. For example, Summer could be really confused or Beth might have a hard time accepting it at first.
Another storyline could be centered around the challenges Morty faces during the pregnancy. Since he's often in dangerous situations with Rick, this could add a whole new layer of drama. Like how they try to keep Morty safe while still going on their interdimensional adventures.
One common theme could be alternate universe adventures where their relationship takes a more romantic or sensual turn in a different dimension. However, it's important to note that NSFW fanfic often goes against the official and family - friendly nature of the 'Rick and Morty' series.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfictions on various topics, including 'Rick x Morty' ones. You can use the search function to specifically look for mpreg fanfics within the Rick and Morty category.
In such a fanfic, one aspect could be how Jessica views Morty. She might initially be dismissive or not even notice him, but as the story progresses, she could start to see his hidden qualities. Also, the fanfic could play with the different dimensions in Rick and Morty. For example, there could be a dimension where Morty and Jessica are already a couple, and Morty from our main dimension tries to learn from that version of himself to win Jessica in his own world.
One popular 'Rick and Morty Summer x Morty fanfiction' story might involve Summer and Morty going on an adventure together without Rick. They could explore a new planet and have to rely on each other's skills to survive. Maybe Summer uses her street - smart knowledge while Morty uses his scientific knowledge he's learned from Rick.
One possible plot is that Morty gets a device from Rick that can make him more appealing to Jessica. But things go wrong, and instead of attracting her, he ends up making a fool of himself in front of her. Another plot could be that Jessica gets into some kind of trouble, and Morty has to step up and be the hero to save her, which makes her see him in a new light.
There could be a fanfic where Rick and Morty accidentally swap bodies. This would lead to a lot of comical situations as they try to adapt to each other's lives. Morty - in - Rick's - body might struggle with handling Rick's advanced technology, and Rick - in - Morty's - body would have to deal with Morty's school and family life in a very different way.
Moreover, NSFW fanfic can have a negative impact on the fan community as a whole. It can create an uncomfortable environment for those who are just interested in the legitimate aspects of the show, like its characters, story arcs, and scientific ideas. It's best to focus on the official content and positive fan - created works that are in line with the show's spirit.
A prevalent theme is the struggle with morality. Rick is a morally ambiguous character, and in fanfic, this is often explored further. For example, how Morty is influenced by Rick's actions and how he tries to find his own moral compass. Also, the theme of friendship outside of their family bond is quite common. They meet all kinds of strange beings, and sometimes form unexpected friendships.
I'm not very familiar with specific 'rick x morty yaoi fanfiction' stories. However, you can try looking for them on fanfiction websites. Usually, the more popular ones will have higher ratings and more reviews from readers.
There are also likely fanfictions where the reader and Summer team up to outwit Rick in some of his crazy schemes. This could add an interesting dynamic as they try to navigate Rick's unpredictable and often dangerous plans.