Dean really couldn't help it.

He'd caught himself watching Sam as he came out of the shower twice now, always looking for what the towel hid.

Dean had found himself waiting to catch a glimpse of what everyone assumed was Sam's monster cock.

Dean was generally straight, he didn't go looking at dicks for fun, but everyone and their mother seemed to think Sam had huge manparts.

Even Chuck, in 'Heart', had Sam full frontal as he was in 'Route 666', and Dean just couldn't ignore the word choice.

Further investigation on the 'slash-fans' brought him to the conclusion that even the fangirls think Dean's junk is considerably smaller than Sam's.

And as the big brother, Dean just can't let that fly.

Dean makes it his mission to prove the world wrong.

And possibly becomes addicted to slash fiction.

It isn't until a week after Dean discovers kink memes that Sam asks him what he's reading, since Dean took to the habit of printing out the slash to read on the road. Dean doesn't know how to respond to that.

He doesn't even remember when he started reading so much ever, but he just can't seem to put the stuff down.

He still denies that Sam has a bigger dick.

A few days later, while they recuperate from a werewolf hunt, Sam is pacing around the motel in nothing but boxers.

Dean can't help but stare.

"Dean?"

"What?"

"What are you doing?"

Busted.

"Nothing?"

"You've been staring at my crotch for the past ten minutes."

Dean isn't going to justify that with an answer.

"I know you've been reading slash Dean."

There's nothing to say to that, and Dean is going to try and deny everything, when Sam plops down on the bed next to him and leans in.

"What I wanna know is why."

Dean swallows, finds that the bedspread is looking especially fantastic this morning, and starts to pick at it.

"Dean,"

Sam comes even closer, breath hot on Dean's neck. He gets goose bumps.

Then one of Sam's hands is wrapping around Dean's neck and tugging him right into Sam's lips, where he stays completely still while Sam gently kisses him.

Dean's cock takes interest, and he starts to return the kiss, nipping on Sam's lower lip and tugging on his brother's hair.

Sam's hand slips down to his boxers, underneath the waistband and grips Dean's half hard cock.

Dean snaps the waistband of Sam's boxers, muttering, "Off,"

And Sam lifts his ass to let Dean pull them down.

Dean totally wasn't thinking that committing incest with his brother is the perfect chance to prove the fangirls wrong.

Sam is still stroking Dean, and it's only slightly distracting as Dean gets an unobstructed view of Sam.

It's full, thick and beautiful, and that might just be the only time in his life he'd ever use beautiful to describe another man's parts, but it's true. A small drop of precome glistens at the rounded tip, and Dean gives up.

"Fuck," He says, staring at Sam's dick.

"They were right."