I Can't Help Falling In Love With You ~~ Cas...
When Cas rips out his grace and put it into a small vial, the first person he turns to is Dean.
"Cas, what did you do?" Dean asked, staring at the glowing glass vial
"I took out my grace."
"Well I figured out that much-"
"I need you to hold onto it for me." Cas interrupted urgently, pressing the small container to Dean's palm
"Why don't you just hold onto it?"
"Because after my memories are gone I won't know it's value."
"Woah, woah, woah, back up a step, your memories?"
"I need you to preform a ritual, one that will erase an angels memories and replace them with a humans. The angels can track me through my grace, but without me having it, they won't be able to find me as well, but if they manage to find me, they can get all the memories of you and Sam." Cas explained, pulling out an old folded piece of paper and holding it out to Dean.
"Because if anything bad happens to you, it's my fault, and this is the best way to keep you safe from the angel's radar. The spell is reversible as well, so if you are in desperate need of an angelic hand. You can bring me -this me- back."
"Are you sure." Dean asked, staring into Castiel's blue eyes, his own green ones marked with worry.