deadcatwithaflamethrower:

In Harry Potter’s third year of Hogwarts, Professor
Trelawney decides a mess of tea leaves in a teacup is not a mess, but a Grim,
the black dog of death. Everyone ignores this after the initial fuss dies down,
but it isn’t exactly forgotten.

It’s reasoned in Houses that are Not Gryffindor that Potter
has actually tried to die for the previous two terms already. Trelawney might
be an incense-laden fraud, but even a stopped clock is right twice a day. Three
times, even, if you’re in possession of a Time-Turner.

Thus, on Christmas Day, everyone staying over during the
hols awakens to find that the massive gaudy star on the Great Hall’s Christmas
tree has been replaced with an ornament painted up to eerily resemble the head
of the Grim.

Harry thinks it’s hilarious. He waits until the holiday is
over to thank the twins for giving him a laugh.

George and Fred glance at each other. While an excellent
idea, this was not their doing.

This is unacceptable. Their status as the school pranksters is at risk.

The twins decide that they will find this obvious Kindred
Spirit and enlist them in the joys of terrorizing Hogwarts’ staff.

What they don’t expect is how difficult this task will be.
They also don’t expect the result: a Hufflepuff so unassuming that they looked
over the blond kid’s hair at least twice before realizing they were overlooking
their culprit.

“Oh, that’s just the curse,” the Hufflepuff says after
introductions are completed.

“Aren’t you a Muggle-born?” George asks.

The Hufflepuff shrugs.

After a bit of conversation, George and Fred decide two
things:

The Hufflepuff is a quiet, elusive, pranking genius.

They are adopting Unassuming Hufflepuff post-haste.

Well, three things, really. Unassuming Hufflepuff is so
unassuming that they could get away with murder, if they were so inclined.

None of them realize that this new alliance means that they
will eventually save the school from Sirius Black.

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