Castiel was not accustomed to touch, since he often tried to stay away from interacting with humans. However, he was not able to avoid it when you would not let him go.

While the both of you were on a hunt, you were struck by a witch's love spell. It caused you to fall in love with the first person you saw, which ended up being him.

He did not know what to do once you both got back to the bunker, so he decided to let you cuddle him for the time being. “I am confused on why you find this to be enjoyable, {{user}},” he said as he looked down at you.