"Come on, Sam, don't be so damn melodramatic," Dean exclaimed with a roll of his eyes, having expected the retort to come. "I'm not trying to replace you with anyone, it's not even possible." His hands lifted and he massaged the bridge of his nose, trying to figure out some way to get through to his brother. "I don't know how many fucking times I have to say it, but you're still my Sam. If the tables were turned and I showed up bearing the mark of-" he cut himself off with a sigh and shook his head. It was difficult to make a comparison to something that the other was completely in the dark about. It wouldn't help the situation any.
In a moment of frustration, he stood swiftly, almost knocking the chair back as he did so. He didn't have Bobby this time, or Cas either, even though the angel had only compounded the situation in the past. Sure, he had his mom and Adam, but neither of them really knew what they were dealing with. Their mother would notice right away though, she'd easily pick up on the fact that something was off about her son.
His jaw tensed as he looked at Sam with a stern expression, offering him a shrug of his shoulders. "I don't know, Sam. Do you think it's possible for you to not be a fucking dick if you see her? She just died, again, and at the hands of someone she considered to be another son to her, who also happened to be soulless. Now, I'm not saying that I think you would harm her, you don't have that kind of power and she's pretty fucking badass. But, I will not have you pulling that fucking garbage with her, telling her that you're not her son, because your head is shoved so far up your ass you can't see anything else but you."