Well, it could be about a female version of Harry Potter who has a unique physical feature like 'birthing hips' and how she uses her femininity in the wizarding world. Maybe she uses her charm and this distinct physical trait to her advantage while facing challenges at Hogwarts, like getting out of tricky situations with professors or outsmarting rivals during magical duels.
One possibility is that the story focuses on the concept of femininity within the Harry Potter universe. The 'birthing hips' might be a symbol of her connection to a more traditional, earthy form of magic. She could be part of a secret society within Hogwarts that values such physical and feminine traits, and they use it to perform a special kind of magic that is different from the regular spells taught in classes.
You can make it interesting by having her 'birthing hips' be a key to some ancient magic. For instance, there could be a hidden chamber in Hogwarts that only she can access because of this physical trait. And as she explores this new aspect of herself, she discovers new powers and a whole new side of the wizarding world.
The fanfic could center around Harry's life outside of the main events of the books. For example, it could explore his summer holidays in more detail. He could be spending time in the Muggle world and using his magic in creative ways to solve normal, everyday problems. He might use magic to help his neighbor fix a broken fence without the neighbor realizing it was magic. This would add a new dimension to his character and show how he can adapt his magical abilities to different situations.
Perhaps in the fanfic, Narcissa adopts Harry because she has a change of heart after seeing the destruction Voldemort causes. She wants to protect Harry as a way to atone for her family's association with the Dark Lord. Harry would then grow up in a Slytherin - influenced environment but still hold onto his Gryffindor values. This would lead to interesting interactions with other Slytherins and a different dynamic within Hogwarts.
The plot might start with Harry being in a vulnerable situation and the Cullens taking him in. They'd have to figure out how to raise a wizard in their vampire household. Harry could start to show his magical abilities which might be both a wonder and a bit of a problem for the Cullens. He could also make new friends in the vampire community, and together they could face some common enemies.
Well, it could be about Winona, perhaps having some sort of adventure on the hips of one of the My Little Pony characters. Maybe she discovers a hidden world there or meets some unique creatures that are only found in that particular area.
One possible plot could be that Harry, having grown up without his parents, yearns for a mother figure. Maybe he starts to see a kind witch in the wizarding world as a mother - like substitute. She could teach him things his mother might have, like family spells or stories about his family's past.
One possible plot could be that the ponies accidentally enter the wizarding world. They might be mistaken for strange magical creatures at first. Twilight Sparkle could be fascinated by the complex magic in Harry Potter's world and try to learn some spells, while Harry and his friends are intrigued by the ponies' unique magic of friendship.
Well, perhaps the plot could involve Rias Gremory taking Harry Potter under her wing in a world where the two fictional universes collide. She might use her devil powers to protect Harry from the threats in the wizarding world that Dumbledore couldn't handle. Harry could also learn some new skills from the devilish side of things, like enhanced combat abilities.
One possible plot could be that the Scarlet Witch discovers Harry as a baby, much like how Hagrid discovers him in the original Harry Potter story. She decides to take him in and raise him, using her magic powers to protect him from the dark forces. Maybe she teaches him some of her own unique brand of magic, which combines with his natural wizarding abilities.
Well, perhaps it could start with Bella Swan finding little Harry Potter in a strange situation, like he's been magically transported to her world. She decides to take him in out of kindness. Then, she might have to deal with the magical aspects of Harry's world that she doesn't understand at first. Maybe she tries to protect Harry from the threats in his own world using her own unique skills.