A plot might be centered around the idea that there is a mystery on Earth that only the fusion of Lapis and Peridot can solve. They start to investigate, and as they do, they learn more about each other. Their fusion's power is the key to unlocking the mystery, which could be related to some ancient Gem technology hidden on Earth. Along the way, they face challenges that test their new bond as a fusion.
The plot could involve Lapis and Peridot fusing accidentally at first. Maybe they are trying to work together on a project, like building a new structure for the Crystal Gems' base. Their powers interact in an unexpected way and they fuse. Then, they have to figure out how to function as this new being while also dealing with the reactions of the other Gems.
One possible fanfiction could be about Lapis and Peridot fusing during a time of great danger on Earth. They fuse to protect their friends and the planet from a new, powerful enemy. Their combined powers create a unique and beautiful form that has abilities neither of them had alone.
Friendship is a very common theme. Many fanfictions explore how Lapis and Peridot form a strong bond despite their initial differences.
One common theme is friendship. Since they are both characters, their relationship as friends is often explored. Another theme could be redemption, perhaps one of them has made a mistake and the other helps them through it.
One common theme might be the exploration of their relationship dynamics. Since they are two distinct characters, fanfic might focus on how they interact and get to know each other better. Another theme could be adventure, where they go on some sort of journey together.
Some dedicated Steven Universe fan communities might have fanfiction archives or threads dedicated to this pairing with the hurt/comfort genre. For example, certain Discord servers focused on Steven Universe fandom. Members often share and discuss their favorite fan works, and it's possible to find some great Lapis Lazuli x Peridot hurt/comfort fanfics there. You just need to join these communities and start exploring.
A good one often has a believable scenario where either Lapis or Peridot is hurt, either physically or emotionally. For example, Lapis might be dealing with past traumas from her time trapped in the mirror, and Peridot is there to comfort her. The characterizations should be on - point, so they act like they do in the show.
One interesting story could be about Peridot and Lapis exploring a new planet together. They might encounter strange creatures and have to use their unique powers to survive. For example, Peridot's technical skills could help them build a shelter while Lapis uses her water powers to find a water source.
Maybe a time - travel plot where Steven, Peridot, Lapis, and Lemon are sent back to a crucial moment in Gem history. They have to work together to make sure the events unfold in a way that doesn't disrupt the present. Along the way, they learn more about each other's pasts and grow closer as a group.
One great fanfiction could be 'The Bond of Lapis and Peridot'. It explores their relationship in a new adventure on Earth. They face challenges together and their unique personalities play off each other really well in this story.
One possible plot could be that as they've grown up, Steven and Lapis start to realize their shared interests in exploring new places. They might go on adventures together, facing various challenges in the process. Along the way, they develop a deeper understanding and friendship that could potentially turn into something more romantic as they support each other through difficult times.