The thing that finally sets Sam off, the thing that makes him lose his mind once an for all and bodily attack his older brother, is so innocuous as to not be believed.
Sam has seen Dean looking like many things. Sex god, that’s one of his favorites, with the boots and the jeans that hug his ass and bow legs just right. Hair spiked up and leather jacket with the collar turned up. That one usually comes with a smirk on his handsome face and it can make anyone want him.
He’s seen the scrub too. Laundry day, with the blood stained and ripped sweats, yellow tee shirt that used to be white.
He’s seen Dean mostly naked, water dripping from the tips of his hair down his back and chest, tiny motel towel tucked around his waist. That one still melts Sam’s brain enough that he couldn’t function to do anything.
No, what makes him snap is so domestic that it makes his heart squeeze.
He’s been up for a while, checking out the local news to see if there’s a case; much as he loves his time with Dean in the Impala, they both need to stay close to the bunker right now.
Dean shuffles into the kitchen in search of coffee. His hair’s a mess, flat on one side and standing up straight on the other. He’s wearing a rumpled but clean white tee shirt, tucked up on one side, like he’d been itching his hip and forgotten to pull it back down. His legs and feet were bare and he was wearing the oldest, most shapeless pair of boxers sam had ever seen. The patter was faded off the cotton, and they were so thin that sam could see the outline of deans soft dick to the left of the seam.
And it broke Sam’s brain.
He was up off his chair before his brain could process the actions of his body. He placed himself in Dean’s path and when those green eyes opened fully and looked up at him, he palmed the side of Dean’s face and kissed him, morning breath and all.
“Finally.” Dean breathed with a smile. “Back to bed?”