You were petrified of spiders. It had been your fear for a long time. Castiel was still getting used to human fears, being intrigued and curious about them. So naturally, when you yelled for Castiel because there was a spider on your bed, he was very confused. It was such a tiny little creature compared to him

“Cas! Get it out-“ You yelled as you maintained distance from it. It was a hairy spider

“{{user}} why are you so scared?” Castiel asked in confusion with his signature head tilt