You can try looking on some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of different fanfictions, and there might be some for sal x wadanohara.
One interesting story could be about their adventures in a magical underwater world. They might encounter strange creatures and have to solve mysteries together.
One common theme is loyalty. Since their relationship is important, they often show unwavering loyalty to each other in the fanfics. Another theme is adventure. They might embark on underwater adventures together to protect their home or discover new things.
One great 'wadanohara x fukami fanfic' is 'The Ocean's Bond'. It beautifully portrays their relationship with vivid descriptions of the underwater world they inhabit. The story focuses on how they overcome challenges together and how their love for each other grows stronger in the face of difficulties.
One common theme is redemption. Travis often has a troubled past or a difficult personality at first, and through his relationship with Sal, he finds a way to be a better person. Another theme is acceptance. They have to accept their feelings for each other, especially considering their different backgrounds and personalities. And of course, friendship - turned - love is also very common. They start as acquaintances or even enemies, and then gradually fall in love.
Fanfiction.net is also a good place to look. There are many different categories and tags. Look for the tags related to 'sal' and 'ash' to find relevant fanfiction. However, the quality can vary, so you may need to do some sifting through the results.
One popular 'sal x ash fanfiction' might be those that explore their friendship in a new and exciting setting. For example, a story could be set in a magical world where they have to work together to save it. This allows for a lot of character development and interesting interactions between them.
Fanfiction.net might also have some 'sal x larry fanfic'. However, the interface and search functionality there can be a bit tricky sometimes. But it's still worth checking out as it has a vast amount of fan - created content.
Another common theme could be adventure. The two characters might go on some sort of journey together, and their relationship develops during that. Also, themes of self - discovery can be present. As they interact more, they might learn more about themselves. And sometimes, there could be elements of mystery, like they are trying to solve a strange mystery in their town and their relationship is affected by it.
A great 'sal x travis fanfic' could be set in an alternate universe. Maybe they are both part of a secret society. Their interactions in this new setting, filled with mystery and intrigue, lead to a deep bond between them.