One idea could be that Steven and Amethyst go on a journey to discover a new type of gemstone together. Along the way, they face various challenges that test their friendship and individual strengths.
Perhaps a story where Steven discovers a new power and Amethyst helps him learn to control it. They could have some really fun and heart - warming interactions during the training sessions.
One idea could be that Peridot and Amethyst are on a mission together and they start off bickering like they often do in the show. But as the mission progresses, they start to understand each other's strengths better. For example, Peridot's technical knowledge and Amethyst's physical power combine to defeat a new kind of enemy. Another plot could be them exploring a part of the Gem world they've never been to before and having to rely on each other to survive. Maybe they discover an ancient Gem relic that has the power to change the way Gems interact with Earth. This could lead to some really interesting character development as they figure out what to do with this new discovery.
Adventure is also a common theme. They go on different quests or face various threats together. This could be something like exploring an ancient gem ruin on Earth or fighting off a new enemy. The theme of acceptance is important too. Accepting each other's flaws and differences. Amethyst accepting Steven's sometimes naive view of the world, and Steven accepting Amethyst's wilder side.
Garnet could be a great addition. Her wisdom and calm nature could provide some contrast to Steven and Amethyst's more impulsive personalities. She could also offer some valuable advice to them during their adventures.
In steven x amethyst love fanfiction, one thing you'll often see is the use of their in - story backstories. Steven's connection to his mother and his role in the Crystal Gems, and Amethyst's own insecurities about being a 'lesser' gem are often incorporated. These elements are used to build a more complex relationship. The fanfiction may also include how they interact with the other Crystal Gems in the context of their new relationship. For instance, how Pearl or Garnet might react to their budding romance, which adds more drama and depth to the story.
Perhaps Steven finds himself in a situation where he has to protect a number of characters, and in the process, they all fall for him. Like he could be on a mission to save some of the corrupted Gems, and as he heals them, they see his pure intentions and are drawn to him. This could lead to a harem where they all vie for his attention in different ways, some being more shy and others more bold in their affections.
One idea could be that Steven discovers a hidden memory of Pink Diamond that changes his perception of her. Maybe it reveals a side of her that was never known before, and he has to come to terms with this new understanding while also dealing with the reactions of the other Crystal Gems.
One good 'Steven x Amethyst' fanfic could be 'The Amethyst Adventure'. It might explore their unique friendship in a new adventure where they discover a hidden part of the Crystal Gem world together. Another could be 'Steven and Amethyst's Bond', which delves deep into how their relationship has grown over time.
A possible plot is that Naruto and Steven are summoned to a world where a prophecy states they will form a harem to bring balance. Each member of the harem has a special role or power related to either Naruto's world of ninjas or Steven's gem world. As they interact, there are comical misunderstandings due to their different backgrounds, but they gradually form deep bonds and work towards fulfilling the prophecy.
One idea could be that Steven tries to understand Blue Diamond's past traumas and helps her heal. Maybe he uses his unique powers of empathy to break through her cold exterior.
One idea could be that the reader is a new gem on Earth and Spinel is initially suspicious but then they become friends through exploring human culture together. For example, they could go to a carnival and Spinel discovers the joy of cotton candy.