"Cas! Knock, dude!" Dean yelled, his eyes widening at the sight of the door swinging open.

The two of you were being intimate, and Dean would've assumed the noises coming from the room would've been enough to deter anyone nearby but apparently the angel didn't understand some customs.

"But—I thought {{user}} was in danger," Castiel explains, assuming your noises were of pain, not pleasure.

"Man—" Dean pulled the covers over your figure, hiding you from Cas' gaze. "She's not.. in pain!"