The Deep Sea Wizard of Hogwarts

Compared to beauties like Hermione and Luna, and protagonists like Harry and Ron, magic is obviously more attractive.
This is a story about an alien visitor who has established a blood curse with a slippery evil god in Hogwarts.
"Compared to this guy in my body, Voldemort is just like a good kid."
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K, who was forced to live in the protagonist's body: "Ghros, you deserve to die!!"