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“Except for you.”
The words rang in Dean's head the second he heard them coming from that dying cop. All he could think of in return was Sam, Sam, Sam, Sam.... Being with Amara was bliss and being with Sam was everything else. Every emotion he'd ever felt had been with him at least once.
He had to shut off his thoughts to help with the station, but it made him only half as good at his job. In that station, half wasn't enough and soon the smoky fog finally came in. Dean's mind went blank when Sam started choking. Too soon the world faded to Dean's perception and there was only his brother as he watched the black veins spread on his arms.
When he started to say it was all done because Dean was going to choose her anyways, he panicked at the thought of it being true. Was it? It couldn't possibly be. He felt despair like no other and the smoke became comforting. Soon he'd be in the same state, he thought.
Chills ran down his spine when he noticed he was immune. Noticed the relief was coming from being in the fog and not the idea of never leaving Sam's side. Noticed his brother was dying in front of him, without him.
Then Sam smiled and the entire world got its color back, even if only a bit. The world grew silent as every single soul infected died, except Sam. Dean would've called it a miracle if the peaceful aura buzzing from his brother's body wasn't so familiar.
“Do you prefer this body? Vessel, you call them.” The voice was his, but the words were Amara's.
“Leave him alone.” Dean growled, unable to move properly with how his body seemed in peace.
“Oh, but I'm not going to do anything to him.” She spoke through him. “I'm going to become him... Seems to be the only way to keep you close.”
“What?”
“Dean! Dean!? What's going on??” Sam grabbed him by the shirt.
“Sam.” It was his Sammy again, but the feeling continued there.