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Dean just accepting that his desire is his own damn brother, ha! Ok sure. And they drive back to the motel like nothing happened, like Dean doesn't have the most gay, incest ass desire for his brother. I'm shocked that they didn't at least give Dean and Sam a gay talk together about it like at all.

Like what do you mean the siren wasn't any of his past girlfriends or just some chick he thought of. Jesus Christ this man needs to bang his brother hard.

But lately I’ve been imagining Sam just leaning into Dean’s possessiveness and controlling tendencies. he knows it’s wrong and he knows he shouldn’t encourage it, but he kinda… likes it.

It makes him feel special, wanted. (and in Sam’s mind there’s nothing better than being wanted by Dean, because he learned how it felt to be unwanted by Dean and it basically broke him).

He likes the fact that he’s Dean’s. That Dean will do anything for him. That so far there’s nothing that Dean hasn’t forgiven him for. That Dean loves him the most out of anyone he might claim to love. That Dean is insane and possessive about him. That he can make world ending mistakes and no one will retaliate because “Do you really want Dean Winchester on your ass?”

The answer is always no.

And Dean’s reputation keeps getting more and more terrifying as the years pass. The guy has his own pet Angel, and eventually has the King of Hell and his Mother on a leash, he also stopped the Apocalypse, he killed Death, defeated God’s Sister, and killed two Archangels.

Sam is Dean’s Little Brother, Best Friend, Lover, and anything and everything in between.

Dean loves him, and no one else.

This is how Sam is possessive and obsessed with Dean.

shhhhhhh don't disturb him he is shifting into depeche mode

I just had to draw the Dean version! And I'll stop now! 

“Please, please, I’msoclose, please,” he slams his head back into the pillow, mouth falling open, allowing only heady whines and shallow breaths to escape. That familiar swirl of heat returns and settles deep in his belly, heating him up from the inside out. His vision starts fading; he tries to keep his eyes on Dean, but they keep drifting upward, little speckles of white peppering the corners. He’s right there, just a couple more seconds, a few more strokes, God, just a lil’ bit more—

“No,” he gasps, “nonono,” he nearly breaks down, sobbing at the complete loss of contact.

“C’mon Sammy, you can hold out for one more round,” Dean finally, finally, pulls his own cock out and settles it next to Sam’s, a sure sign he’ll actually be allowed to get off sometime tonight. “Think you can do that, baby brother?”

Sam’s eyes roll right to the back of his head. His incest kink—is it an incest kink if you’re fucking your actual brother?—dials him up to a hundred, something he never thought possible. He gasps and involuntarily thrusts upwards, looking for friction, but is met with two big hands pinning him down by the waist, forcing him still.

“Yeah,” he drawls, and Sam can hear the shit-eating grin on his face. “‘Course you can. You wanna be good for your big brother, don’t ‘cha? You wanna make me proud, right, Sammy?”

And he’ll be damned if he disappoints Dean again, so he sucks in a breath and nods, strapping in for the long haul.

Or if he saw him as an "two in one" because he always came with Dean, Bobby wanted to be Dean's father, but Sam came along and he was just like "nah, I can handle it" but he never really seems to prioritize Sam's feelings

sam: definitely dad. i could never hurt you

dean:

Take for example the way they gently examine eachother after the other is hurt (or even assumed hurt) how quickly they fall to their knees, running hands over faces - cradling gently and touching softly, speaking in hushed tones

I can't imagine that not spilling over to their sex life.

Soft whispers and affirmations of "I can't believe I almost lost you" or "Don't you ever leave me again" maybe even "How could you do something so stupid??"