You don’t understand how bad I need demon!Dean to be really thirsty for Sam. You saw that eye fuck Dean gave Sam when he had the blade on his throat? I need that always.
I need him sneaking on Sam early in the morning and pressing their bodies really close to whisper "Good morning, Sammy" with his mouth pressed right on Sam’s ear. I need Dean sitting on a chair with his legs spread open like an obscene piece of shit, winking at Sam when he catches him staring “Enjoying the view, little brother?”. I want him running his fingers along Sam’s hipbones over his shirt, smirking up at his brother, commenting about how all that ‘incest is taboo bullshit’ gets really old when you are demon and how he always knew Sam had more than brotherly feelings for him anyway. I need demon!Dean hitting on Sam with no shame, throwing him winks and blowing him kisses, casually bringing up how much he would like to press Sam down and make him moan.
Just making Sam this blushing-turned on-confused mess the entire time, always on the verge of just saying “yes" to all the things Dean’s offering.