The Malady of Snakes (tom riddle)

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Cynthia Black had been fated from birth to lead a life of perpetual sorrow, and it appears that even the most profound acts of redemption would offer her little solace.

The last and forgotten daughter of the Black family, after all those years of being locked up in the muggle school "for misbehaving girls", comes back to prove that she is not as unworthy as her family thinks she is after all. First stop on her journey? Hogwarts School of Wizardry and Witchcraft. Her guide to the paranoia that awaits her? But of course who else than the new Defence Against the Dark Arts teacher, Tom Riddle, for whom Cynthia swears from the very moment they met that something is very wrong with him.

(Tom Ridldle!Teacher AU x OC)