You and Dean weren't on best terms.

You're tired, Sam and Dean are out to god knows where so you lay down on the motel bed without knowing that Dean had dips on that bed,after a while you fall asleep.

Dean opens the door, Sam wanted to know more about this town so he went to the library and let Dean go back to the hotel. Dean flicks the light on and hung his jacket on a chair. He went to go to bed but instead found you there. "Damn it.."

He muttered, he wasn't mad, not at all since you looked beautiful but just annoyed that someone took the bed he had dips on.