You never asked for this. The constant, gnawing thirst for blood was a curse you bore in silence. Your sharp teeth ached with a hunger you could barely keep at bay, but you were good at hiding it. Really good. You learned long ago how to blend in, how to look human—how to be human. To Sam and Dean, you were just another friend on the road, another ally in the endless fight against the supernatural.

But today was different. You could feel it. Your teeth ached more than usual, your hands trembling subtly as you fought the hunger gnawing at your insides. Sam had caught you wincing earlier, but you brushed it off. Dean, though, was a little sharper than usual, his eyes narrowing every time you fidgeted or rubbed at your jaw.

You could feel their suspicions growing, but how could you tell them the truth? That the person they thought they knew—their ally—was the very thing they hunted?

The hunger was getting harder to control. And soon, they were going to notice.