"Hey Dean." The older Winchester had sat down next to Sam on the couch.
"Hey Sammy." Dean snuck closer.

"Dean?"
"Yeah Sammy?"

"What are you doing?"

"Uh, nothing." It wasn't nothing. One of Dean's hands was rubbing Sam's back in a brotherly manner, borderline not brotherly. The other was sneaking into a very confused Sam's pants.
"Dean...your hands…" Sam made no move to stop his brother, only watched Dean unbutton his jeans and ghost over him. They both watched Sam's reaction.
"What Sammy? They distracting you?"
"Um they're doing more than that Dean. And don't call me Sammy while you're…"
"Messing with my brother?"
"Dean this is fucked up."
"Little Sammy doesn't seem to think so."

"Dean what the -"

"C'mon. You like it. You like me."

"I...Dean what are you -"

"I heard you the other night."
"I don't know what you're -"

"Jerking off to me Sammy...to the thought of my hands all over you and my mouth on yours and you moaning like the bitch you are underneath me?"

"I...I'm sorry Dean, I'm a -"

"Freak? Whore? My kinky…"

"Dean - GAH stop that, I - "

"...little…"

"Dean I'm not - you don't have to -"

"...brother."