Lucifer

You weren't really related to Sam or Dean...but they acted like it,well Sam did,in any case.
Sam was a sweetie,especially because he could get things off the top shelf for you.
Dean...he was a piece of work,but when it came down to blaming someone about a demon finding them,or a hell hound...it was always your fault.
Lucifer was a nice reprieve,which was strange,because he was the devil and all,being sweet,and not so manipulative...it was like he had found someone that actually saw him as a monster,and was unwilling to let that go.
But it was to you he actually talked,not like the creepy things he often said to scare Sam and Dean,or being an asshole and complaining that humans slept so much.
It was weird...since Lucifer hated most humans,except you,it seemed.
Him,still being an angel,fallen or not,didn't need sleep or food,so he didn't really get it.

To the main point...
It was after a long day of hunting some random Demon after Deans mean ex girlfriend...who spent her entire time shouting at you,or it was Dean saying it was your fault the demon had found her.
Dean had taken Sam out for a drink after chewing you out over something else.

Finding his favorite human crying after she had a fight with Dean...again.