Based on Season 2, Episode 10 "Hunted"
Prompt: "Dammit Sam, this whole thing is spinning out of control" – Dean
Although Sam knew what his brother was supposed to be talking about, he wasn't fooled for a second about to what Dean was actually referring.
Them. They were spinning out of control. Hunts and yellow eyed demons aside, what they were going through was a kind of evil that no hunter had ever laid a finger on before.
And it wasn't even like it was new, sure it hadn't been around for a while following Jessica's death, but they had been getting each other off since their teen years. An extra hand here, a blow job there. It was only in the last few months they'd started fucking. It was just a way to cool an itch – saved them the trouble of hitting random bars, and on random women.
Just it was becoming more frequent – and it wasn't a race to the finish anymore. They were spending hours spinning it out; languishing in the feel and taste of each other. Spinning out of control.
They had to choose whether to be brothers or lovers, because they were going dizzy trying to do both.