Supernatural OneShots, Preferences, Imagines and Chat Rooms

Imagine: Finding Out Cas Isn't Cas Anymore (Season 11 Spoilers)

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Imagine finding out Cas is being possessed by Lucifer.
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You walked back into the library with Sam. You saw Cas doing something with ingredients scattered around him.

"Hey. Cas, what is that?" You asked, walking over to him.

"It's your spell of gathering," Cas replied simply, not stopping what he was doing.

"Are you nuts? You're not strong enough, Cas," Sam said, sounding worried.

"You could get hurt," You warned.  Cas sighed and looked at the two of you.

"You find a better option?" He sassed.

"Well...No, but without a serious boost to your angel power, that spell won't even work," you added, concerned for your best friend.

"My strength may surprise you," Cas replied returning to working on the spell.

"Wait a second. I remember Bobby told me, when you needed strength to retrieve us from the past, you used him to power up. You -- you touched his soul. Right?" Sam asked. Cas hesitated before nodding.

"That's right. I did that. But that- that, uh, procedure it can be fatal," Cas replied, seeming slightly unsure. You raised an eyebrow at his strange behavior.

"Use my soul. That way, maybe you'll have enough power to wield the spell," Sam said. You looked at him in surprise.

"Sam?" You questioned his insane idea.

"That isn't necessary," Cas interrupted.

"It's worth the risk. Cas, Dean needs our help. I trust you," Sam said. Cas smiled before letting out a childish laugh.

"What?" You asked, starting to really get worried you hadn't seen Cas laugh in maybe years, but now he was laughing at Sam's trust in him?

"Oh, it's ju- I don't- I don't need you anymore," Cas laughed, turning to the two of you. "I mean, Dean's the one with the link to Amara. Why have I been trying to spare you two?"