Perhaps in the fanfic, female Harry discovers something about Remus that others don't know. And in giving him this 'middle' she is actually giving him a key to unlocking a part of himself. It could be related to his past, his family, or his identity. This could then set off a chain of events that not only changes Remus but also has an impact on the overall story of the wizarding world that they inhabit.
It could be a story where female Harry and Remus form an unexpected friendship. She gives him something 'middle' which could be a middle ground in his beliefs or his relationships. For example, she might help him find a balance between his life as a wizard and his life as a werewolf. And this new friendship might lead to changes in the way he interacts with other characters in the Harry Potter universe.
One possible plotline could be that female Harry has some special knowledge or ability that she wants to share with Remus. Maybe she has a unique perspective on the wizarding world due to her own experiences, and she uses this to help Remus in some way, perhaps in dealing with his werewolf nature.
I haven't come across a particular 'female harry gives remus middle' fanfic myself. But you can also look into Tumblr. There are a lot of fanfic enthusiasts on there who might have reblogged or recommended something similar. Just search for the relevant tags related to your request.
Maybe in the fanfic, Naruto discovers that his parents' death was not as straightforward as he thought. If he finds out that some powerful individuals in the village were actually involved in a conspiracy that led to their deaths, this revelation could be the trigger for his descent into hatred. He might then turn against the village and its leadership, using his powerful jutsu not for protection but for vengeance.
There could be a story where a dark wizard is trying to use werewolves for his evil plans. Harry, Hermione, and Remus get wind of it. They then work to stop the dark wizard. Along the way, they face internal struggles as werewolves, like Remus dealing with his self - loathing and Harry and Hermione coming to terms with their new werewolf identities.
A plotline could involve Sirius and Remus trying to raise Harry while dealing with their own personal traumas. Sirius with his time in Azkaban and Remus with his lycanthropy. They could also face challenges from the Ministry of Magic, who might be suspicious of their non - traditional family unit. And of course, there could be a love story arc between Sirius and Remus that weaves in and out of Harry's upbringing.
One possible plotline could be that Harry discovers he has a unique magical ability that allows him to give birth, and he has to go through the process alone in a secret place to protect his unborn child from dark forces. Another could be that he is magically cursed to give birth alone as part of a villain's revenge plot.
One possible plotline could be that Harry discovers he has a unique magical ability that allows him to give birth. He has to keep it a secret from his friends at first because he's not sure how they'll react. As the pregnancy progresses, he struggles with the physical changes and the fear of being alone. Another could be that some dark magic has been cast on him which results in this situation, and he has to find a way to reverse it while also dealing with the impending birth.
One possible plotline could be that as a female Harry Potter, she discovers the world of One Piece and becomes a huge fan of Shanks. Maybe she tries to incorporate some of the values she admires in Shanks, like his loyalty and courage, into her fight against Voldemort. For example, she might be inspired by Shanks' selfless act of sacrificing his arm to save Luffy and be more willing to put herself in danger to protect her friends at Hogwarts.
Perhaps she is initially conflicted about her transformation into a Dead Apostle. She could struggle with her identity, having been a hero in the wizarding world as Harry Potter. She might then go on a journey to either accept or reject this new part of herself, all while dealing with the various factions and powers within the Dead Apostle world. This could involve her making alliances or enemies in unexpected ways. For example, she might encounter other magical beings who are also involved with the Dead Apostles in some way and have to decide how to interact with them.
One possible plotline could be that Remus and Snape are forced to work together on a special mission within Hogwarts. They initially clash due to their past differences, but as they face various challenges together, they start to respect each other more. Then, they both have a connection with a third character, perhaps a new teacher at Hogwarts. They form an unlikely alliance to protect this person from some dark forces that are emerging in the wizarding world. This new bond gradually develops into a deep friendship that has elements of a threesome relationship in terms of their shared experiences and mutual protection.
One possible plotline could be that Sirius and Remus initially struggle with their inappropriate feelings towards Harry. They might then realize it's wrong and instead focus on their roles as his protectors. They could channel their strong emotions into teaching Harry more about his parents and the wizarding world, turning a potentially dark concept into a positive mentoring relationship.