They'd already established they could never, ever be normal. Maybe going right off the reservation was the only answer for them. After all, they were both so very twisted and broken. Sam was an ex-demon blood junkie, Dean was an ex-torturer. Both had been to Hell. They were hardly saints. But were they prepared to cross this line? This was one sin that could break whatever bond they had between them.
Despite Dean's questioning, he hadn't pushed Sam away or punched him in the face. Maybe that was a positive sign. Or maybe they were both as stunned as each other. After all, Sam had never looked at Dean as anything but a brother before. Then again, his mind was hardly in the best place emotionally.
It was so wrong, even for them. Yet Sam couldn't stop himself closing the gap between them to press his lips to Dean's.