There is indeed some. You might have to search through different tags related to 'Harry Potter', 'Remus Lupin', and'slash' on fanfiction platforms. Keep in mind that while some of these fanfictions can offer interesting takes on the relationship, they are not part of the official canon.
One common theme is the internal struggle. Harry might struggle with his feelings because of the social norms in the wizarding world or because of Remus' position as his teacher/friend. Another theme could be the exploration of forbidden love, as it goes against the typical teacher - student relationship boundaries.
One common theme is the struggle with identity. Remus Lupin is a complex character with his werewolf identity, and in slash fanfiction, this often adds an extra layer to his relationships. For example, how he reconciles his different sides with his romantic or sexual relationships.
One common theme is mentorship evolving into something deeper. Remus is often seen as a mentor figure to Harry in the original series, and in the fanfiction, this can transform into a more romantic or intense bond. Another theme is the struggle with Remus' werewolf identity and how Harry accepts and deals with it in the context of their relationship.
A common theme is also the idea of a safe haven. Given their difficult lives, they create a safe space for each other in these fanfictions. Whether it's a physical place or just the emotional bond they share, it's a place where they can be themselves without judgment. This is often explored in detail, especially in relation to how they deal with the outside world that can be so unforgiving towards them.
Another theme is the struggle with forbidden love. Given the relationship between them, in terms of teacher - student or the age gap in some cases, there's often a sense of it being something that society in the wizarding world might not accept. This creates a lot of internal conflict for Harry.
One common theme is the struggle between friendship and romantic feelings. In the Harry Potter world, the characters often have deep friendships, and when a crush develops, it can create a conflict. Another theme is the secrecy of the crushes. Many times, the characters are afraid to reveal their feelings.
A great one is 'Crush in the Shadows'. Here, the author writes about how Harry's crush on Remus is intertwined with the events happening in the wizarding world. It's not just about the crush, but also how it affects Harry's actions and decisions during dangerous times.
One popular Harry Potter Remus Lupin slash fanfiction is 'All Our Yesterdays' which explores an interesting relationship dynamic. It has well - written characters and a captivating plot.
One great 'Harry Potter and Remus Lupin slash fanfiction' is 'The Moon's Shadow'. It delves deep into their relationship in a way that stays true to the essence of the characters from the original series. The author does a wonderful job of exploring their connection and the challenges they might face within the wizarding world.