Another theme could be the discovery of their merman identities and how that affects their relationship. For example, they might face challenges from their merman clans that put a strain on their friendship or something more. Also, there are often themes of adventure, like exploring the deep sea together and encountering new sea creatures and mysteries.
One common theme is the exploration of their relationship in a new, underwater world. Since they are mermen, it adds a different dynamic to their already complex bond.
Some specific fandom - dedicated forums might also be a good place to look for this type of fanfiction. These forums usually have sections for fan - created works, and if there are enough fans of Free! who like this concept, there could be some really interesting Rin x Haru merman stories posted there.
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.
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 friendship. Many fanfics explore how their initial friendship blossoms into something deeper. Another theme is self - discovery. As they interact more, both Haru and Rin often discover new things about themselves.
One common theme is friendship evolving into something more. Since they start as friends and teammates, many fanfictions explore how their relationship deepens romantically. For example, they might realize their feelings during a training session or a competition.
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.
Well, one common theme could be the deep emotional bond between Rin and Haru. Even without the inappropriate aspects, their relationship is often explored in terms of loyalty and mutual understanding.