When Cas was an angel, years had been nothing. Centuries had seemed like hours, and hours had seemed like seconds. But now… now that he was human, Castiel was beginning to feel time in a way that he never had before. Looking in the mirror now, he noticed slight shadows beneath his eyes, creases in his face where there hadn't been before. And he slept. Of course, that wasn't a completely foreign concept. Dean would sleep beside him so often, but that state of unconsciousness had never been anything that applied to him.
"Cas?" Dean looked up at him from beneath the messy pile of sheets on his bed. "What are you doing?" Cas saw the black of his boyfriend's eyes show for a fraction of a second. Shaking his head, he sat back down on the mattress.
"Nothing. This is just… I feel so strange."
"In love strange?" Dean asked, a smirk on his freckled face.
"Human strange," Cas corrected, leaning his head against Dean's chest.
"That might be the same thing."
"It's not."
"How would you know, Cas? You've only been human for, what, a few weeks?"
"You love me," Cas said, blushing at how naïve he probably sounded. "And you're not human. Not anymore." He looked down at the sheet he clutched in his tan hand. "I mean… I should…" Cas started to stand up, staring at the floor.
"No, you should stay."
"Dean…"
"I love you, Cas. I always have, damn it. Maybe you're the human one now and I'm the one that's going to live forever, but that doesn't change anything. Maybe we only have today, or maybe we have a hundred years, but I'll love you every second."