Based on Season 4, Episode 1 "Lazarus Rising"

Prompt: "So are you two like, together?" – Ruby

Ruby left the room and stormed into the corridor. She had only said it to wind Sam up, but she was writhing inside. Playing a stranger was important – all part of the plan – however long term that plan might be. And it wasn't like she cared about Sam, he was necessary that was all, but she still didn't appreciate being shoved out of the picture just because Dean was back.

It was the reason she and Sam had started sleeping together in the first place – she may have acted like she had no idea, but she knew Sam was only latching onto her because she was wrong: forbidden. Dean was gone and he needed that fix; that adrenaline rush of being on the edge of an immoral precipice.

She knew that for him too, the sex was a means to an end. An end that had come to soon – for the second Sam saw Dean she knew she had lost him.

Now dressed, she turned down the corridor to leave when Bobby vacated the room also, shutting the door firmly behind him.

"They need a few minutes" He explained. From the room behind him there was the unmistakable sound of bed springs creaking. "A couple of hours," Bobby amended.

"And you're sure they're just brothers, right?" Ruby questioned, cocking an eyebrow.

Bobby looked suitably embarrassed.