Perhaps Harry has always felt an inexplicable draw to the world of Greek mythology, and through some research, he uncovers his connection to Medusa. Medusa, on the other hand, has been aware of Harry's existence but was unable to reach out until now. They then embark on a journey to find out more about their shared past and end up in a situation where they need to protect each other from various threats.
Another plotline could involve a magical object or spell that binds Harry and Medusa's fates. They are brought together by this magical entity and have to figure out how to break free from its control while also dealing with the implications of their relationship. Along the way, they meet other mythological and magical creatures who either help or hinder them in their quest.
I'm not sure if there are many fanfics with this exact concept. It could be a very unique and interesting take. Maybe in such a fanfic, Harry's wizarding world and Medusa's mythological realm collide in some unexpected ways due to their 'separated at birth' connection. It might explore how their different powers interact and how they come to terms with their strange relation.
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.
Perhaps Medusa has some crucial information that Percy needs to save the world, and in order to get that information, he has to protect her from other threats. So he embarks on a journey to keep her safe.
In this fanfiction, it could be that the Medusa's curse affects Harry's appearance as well. He might start to have snake - like features. This would cause him a great deal of distress. His journey could involve not only finding a cure but also coming to terms with his changing self. He could meet new characters who have knowledge about the curse and they could guide him on his path to break free from it.
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.
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A plotline could involve Petunia having a change of heart due to a magical event. For instance, she might accidentally stumble upon some of Harry's magic or receive a message from the wizarding world about his importance. This could lead her to stand up against Vernon and protect Harry. She could then start to teach Harry about his mother's side of the family and the magic that runs in his veins in a more positive way than the Dursleys ever did. And perhaps she even helps him develop his magic skills secretly before he goes to Hogwarts.
One possible plotline could be that Harry, being a wizard from the magical world of Harry Potter, somehow gets involved with the dark and supernatural world of Hellsing. His magical abilities might be a source of both intrigue and conflict. Maybe he uses his magic to help the Hellsing organization in their fight against vampires and other dark creatures, and during this process, he falls in love with a character from Hellsing and they get married.
Perhaps the hickey is a result of a romantic encounter with a mysterious character. And the fic could revolve around Harry trying to figure out his feelings for this person while also dealing with the physical evidence of their closeness. The plot could also involve his friends noticing the hickey and teasing him or being concerned about him.
One possible plotline could be that Harry is cursed and slowly turns into a dragon. As he changes, he has to deal with the physical and mental challenges of this transformation. His friends would try to find a way to reverse the curse while Harry struggles to control his new instincts.