The Demon That Lives In My Basement

The creature growled at the twins, holding a tome to his chest. Tears leaked down his face and he wiped at them agressively. "YOU aren't aloud here."

Bill put an arm around Will, who held him tight, and kept his weapon raised defensively.

As soon as the creature barred it's teeth and it's claws came into view, Bill had to get him and his brother out of there.

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Loosely based on the Abduction AU... mostly based on Beast!Dipper... because I had the idea before I learned of this beast nonsense.