"Sam, it is not what it looks like!"
Dean tries to explain the situation to his brother, as he chases him up the hallway, swiftly wrapping his dressing gown around himself.
"Sam!"
Finally he catches up with his brother in the kitchen. The youngest Winchester is gripping the sideboard, as he tries to maintain his anger.
"Seriously man," Dean's voice a little calmer now. "Nothing happened."
"You were naked in bed together, Dean!"
Sam is furious. His face bright red with rage, his voice a few decibels louder than it needs to be. He can barely look his brother in the eye right now.
"Well, yeah, it's Cas," Dean explains, desperately trying to come up with an excuse on the spot. "We both know he is one stick short of a lolly. He must have stumbled about drunk last night, and just jumped in the first bed he found."
"Oh please! Your really expect me to believe that, Dean!"
"What's the deal anyway? Would it really matter if something did happen?"
Dean had to ask. He needed to know why Sam was getting so worked up over this. He's never been so bothered by Dean bringing a girl home before. He barely even mentions it usually, Sam just laughs it off, or makes a sarcastic comment, but that's it. Why is this so different?
"Dean, stop!" Sam finally makes eye contact with his brother, still arguing with him through gritted teeth. "You are not gay! You've been with more women than every guy along the west coast - combined! You can't be… you're not gay!"
Sam grabs his jacket from the back of the dining room chair, and dashes out of the room, grunting to himself.
"Where are you going?" Dean calls after him. "Sam!"