Heart
Something feels wrong. It shouldn't end this way. Sam isn't supposed to be inside there, wasting her, killing himself.
He is such a wretched soul, too much blood on his hands. He is to blame for his father's death. He caused Marshall's, and perhaps, Layla's too. Then there was that vampire in Montana. They all have chipped away at his heart. He'd be broken in the end.
There's no need to break another.
Something is wrong. This is what the demon wants, turning his brother into a killer, a monster. He can't let him be. He has to save him. He promised to save him.
Blam
The door gives way under his hard sole. Soon, the gun slips away from Sam's sweat-soaked grip into his own, him taking advantage of Sam's startled pause.
Let his hands be dripping with more blood now.
"Dean, no! I will do it. She wants me to. I—"
Bang!
He turns to Sam's stunned gaze, his voice sounding hollow in his ears.
"Everything's going to be fine, Sammy. You'll be safe. Nothing else matters."
fin