Fics like Just a Few Changes (will Keep you Safe)

It's been over five years since Voldemort's defeat when Harry Potter gets pushed through a portal and falls into the Great Hall of Hogwarts. This wouldn't be a problem, exactly, except it's his parents' Hogwarts instead of his own. Thankfully, Hermione and Ron aren't about to let him face this newest form of trouble by himself. Even more fortunately, Hermione says they're in a different dimension entirely. Harry has a castle full of living ghosts, his best friends by his side, and three to six months to make just a few changes. Starting with a snake.

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