Sam is back to scratching the back of his head awkwardly. Dean may be totally nonchalant about sex but Sam's a little more private than that.

And alluding to anything about what they were doing, with Buffy there, more importantly, is not something he wants to do.

"We're both good," Sam says, clearing his throat. "Real good. Aside from the obvious. We--yeah. You?"

Why the eff would Dean be injured right now, Sam? Seriously. Your deflection fails.