Perhaps Snape is under a spell or a magical obligation that makes him carry Harry in such an unusual way. This could lead to comical situations at first, with Harry being confused and Snape being grumpy about it. But then, they might find themselves in a magical location where they have to rely on each other. Snape's knowledge of magic and Harry's natural courage could combine to solve a mystery or defeat a foe. For example, they could be trapped in an ancient, enchanted forest, and by working together, they find a way out and also uncover a hidden power or artifact.
The situation where Snape carries Harry on his hip might be part of a time - travel plot. Maybe Harry is sent back in time accidentally, and Snape has to take care of him to ensure the future remains intact. Snape could initially be very hostile towards Harry, but as he realizes the importance of Harry's role in the future, he starts to warm up. They could then experience key events from the past together, and Harry could gain a new perspective on Snape, seeing him not just as a strict teacher but as a complex and misunderstood figure who has his own battles to fight.
It might explore a more family - like relationship. Snape could be seen as a father figure to Harry in this fanfic. The act of carrying Harry on his hip is quite an intimate gesture, and it could symbolize Snape taking on a parental role. They could have heart - to - heart conversations, and Snape could share his own experiences of growing up in the wizarding world, giving Harry a different view of the man he thought he knew.
One possible plot development could be that Harry initially struggles with having Snape under his 'command' in some way. Since they had a very strained relationship in the original series, Harry might be hesitant to trust Snape even if Dumbledore has given him this new role. He could start by trying to figure out Snape's true intentions.
Maybe the story could develop with Snape trying to understand why Harry is a Malfoy fan. He could start to investigate Harry's past interactions with the Malfoys and any hidden reasons behind his admiration.
Maybe Harry starts using lethal force against Death Eaters. This could lead to a more vengeful and darker path for him. His friends might be divided in their support for him.
In a post - war fanfic, Harry could be living in a more integrated wizard - Muggle society. There are still remnants of dark forces, but now the wizarding world is more open to Muggle technology. Harry, being a symbol of protection, decides to carry a gun as an additional means of safeguarding the peace. He trains with Aurors and Muggles alike to master the use of the gun, and along the way, he faces challenges from traditional wizards who oppose this new direction.
The gun could be a gift from a Muggle friend who doesn't understand the wizarding world but wants to give Harry something to protect himself. Harry might initially be hesitant to use it but then find situations where it becomes necessary, like when facing dark wizards who have put anti - magic shields up.
One possible reason could be that in the fanfic, Harry discovers Snape's deeper motives earlier. Maybe he stumbles upon Snape's memories or has a series of interactions that show Snape's true loyalty to Dumbledore and his complex role in protecting Harry all along. This new understanding makes Harry admire Snape.
Another aspect could be related to his family heritage. Harry could inherit a special magical artifact that was passed down through the Potter family. This artifact might hold the key to some long - forgotten magic or a prophecy. As he explores his inheritance, he uncovers secrets about his family's past and its connection to the overall history of the wizarding world, which in turn helps him in his fight against Voldemort.
One possible plot development could be that Snape initially struggles with his feelings towards Harry. He has his own past grudges against James Potter, but as he sees the extent of Harry's abuse, his protective instincts kick in. He might start teaching Harry advanced magic in secret, away from the prying eyes of the other Hogwarts staff and students, especially those who might be skeptical of Snape's motives.
Well, it could be that Snape is wrongly accused of a great crime in this fanfic, and in the heat of the moment, someone attempts to kill him. Maybe it's a misdirected act of revenge by someone who thinks Snape is behind a series of dark events at Hogwarts. But of course, the truth might be far more complex and intertwined with the overall politics and secrets of the wizarding world.