Okay, so this is a very short conversation that I'd like it to happen in 9.01 ever since I read the (not sure if true) rumour that Cas will call Dean on the phone. Dean/Cas friendship, no slash since I try to stick to canon as much as possible. Although you can interpret it either way!
Warning: Implied suicidal thoughts.
Disclaimer: I own nothing!
"Dean."
"Cas? Is that you, man?"
"Yes."
"Where are you? What the hell happened?"
"Metatron. He tricked me. I'm sorry, Dean."
"It's fine. It doesn't matter, okay? I need you here, with us. Can't you just zap over here?"
"I can't. Metatron... he took my grace, Dean. It was part of the spell he used on me. I think I-, I think I'm human."
"Okay. Okay, listen. We'll work it out, okay? Just tell me where you are and once Sammy's back on his feet, we'll go get you, alright?"
"..."
"Listen, I know you're probably feeling guilty as fuck right now, but the angels are pissed and are going after you... So don't get yourself killed, okay buddy? ...Cas?"
"..."
"Cas, you've gotta promise me. Promise me you will try not to get yourself killed."
"Dean, I'm sorry."
"Cas—"
Beep Beep Beep
"Dammit Cas!" Dean shouted as he banged the table angrily and let out a very worried sigh.
Fine, he thought to himself. Now he didn't only have his little brother dying of God knows what, he also had his best friend lost God knows where, depressed and about to get himself killed. This day couldn't get any better, he thought sarcastically.