One great pick - up line could be 'Are you a Time - Turner? Because every time I see you, I feel like I'm getting an extra hour in a day.' It's cute and plays on the magical item from the Harry Potter world.
One great pick - up line could be 'You must be a Patronus, because you just chased all my dark thoughts away, just like in those Glee - inspired Harry Potter fanfic moments.'
Here's a simple one: 'Are you a Quidditch broom? Because you sweep me off my feet.' It's a direct and easy - to - understand pick - up line that relates to the popular sport in the Harry Potter universe.
Try this one: 'Are you a demigod? Because you've got the power to make my heart race faster than a satyr at a party.' Satyrs in the series are known for their energetic and wild nature, so comparing the effect the person has on your heart to a satyr's energy is a fun way to flirt. It also ties in the concept of demigods which is central to the Percy Jackson world.
Here's another one: 'Are you a demigod? Because you've just stolen my heart like a master thief, just like Percy would steal a bolt.' This line combines the concept of demigods and Percy's own adventures where he had to steal Zeus' bolt. It shows a bit of humor and a connection to the story.