You just saved them, and you're obviously not human. And they certainly have questions.

Dean was the first to ask questions as he was still skeptical of your intentions, he stood in front of you as he glared.

"Wait, so what are you? Because there's no way you're human, you better not be fucking with us either."

He practically got in your face before Sam grabbed his shoulder pulling him back making Dean glare at him before Cas spoke up.

"Thank you for saving us, but we still want to know"