I'm not sure specifically about lemon fanfiction involving them as it often goes against the general family - friendly nature of the original work. However, you can try searching on some fanfiction platforms and look for well - written non - inappropriate stories about their relationships.
One common theme is their friendship. You can find stories that explore how they became friends, the ups and downs in their friendship, and how they support each other through difficult times. For example, a story might focus on how Rin helps Haru get over his fear of change in the swimming world.
Lemon fanfiction often goes against the ethical and family - friendly nature of most fandoms. Instead, for rin x haru, you can look for fanfictions that focus on their complex relationship. Maybe stories about how they first met as kids and how that initial encounter shaped their future interactions. There could be ones that delve into their competitiveness in the pool and how that rivalry is also a form of deep connection.
Rather than seeking lemon fanfics for Rin x Haru, consider exploring fics that delve into their character development. For example, fics that show how they support each other during competitions, or how they come to understand each other's dreams better. There are many great fanfics out there that can offer a deep and engaging story without inappropriate content.
One great Rin x Haru mermaid fanfiction is 'Under the Sea's Embrace'. It beautifully weaves the mermaid lore with their relationship. The author creates a vivid underwater world where Rin, as a mermaid, discovers a connection with Haru that goes beyond the ordinary. It has some really touching moments that show their bond in a unique way.
Friendship is a very common theme. Writers often explore how the deep bond between Rin, Haru, and Makoto affects their lives. For example, they might write about how they support each other through tough times in school or in their swimming careers.
Swimming is also a big theme. Given that they are all swimmers, many stories will involve them training, competing, or having some kind of revelation related to their swimming careers. For instance, a story could be about how Rin's new training technique inspires Haru and Makoto to improve their own skills.
One common theme is the exploration of their deep emotional bond. Since they have a complex relationship in the original story, in the Yaoi fanfictions, this bond is often intensified and turned into a romantic or sexual relationship. For example, they might struggle with their feelings for each other while also dealing with external factors like their swimming careers.
One common theme could be care and concern. For example, if Rin is sick, Haru might show his worry in a very characteristic way, like being more protective. Another theme could be vulnerability. When sick, the usually strong - willed characters become more fragile, which can add an interesting dynamic to their relationship.
One common theme is the exploration of their deep emotional connection. Since they are often portrayed as having a strong bond in the original work, fanfiction may delve deeper into how that bond could develop into a romantic or more intimate relationship in a Yaoi context.