So after Dean saw Sammy for the first time drink demon blood, he and Bobby tricked Sam to go into the panic room, where they shut the door behind him. Locking Sammy in side. Sam banged on the door and screamed at them to let him out, but they didn't listen to a word he screamed. After some time of realizing that they weren't going to open the door and let him out of the panic room, Sam began to pace around the small room. He was sweating and his hands were shaking a little bit due to the withdrawal of demon blood.

Sam turned around when he hear the small window in the steal door open up.
Sam- "Okay, let me out. This is not funny."

Dean- "Damn straight."

Dean's voice was very calm and collect. He stared at his little brother through the saw opening. He could see that Sam was pissed at him but Dean had to keep in mind that this was what was best for Sammy. Sam walked closer to the small opening in the door.

Sam- "Dean, come on this is crazy."

Yeah Sam knew he screwed up, he knew that Dean probably was very upset and confused when he saw him drinking the demon blood, but he had too. He had run out and was growing weaker by the second and he really needed it in his system and that demon was right there and it was simple at that very second to to cut it's neck and drink some. He didn't second it until he turned and saw his big brother's face. Sam walked closer to Dean.

Dean- "Not until you dry out."

Dean's face was very still, and trying to show no emotions towards his brother. He stood there and watched Sam before him. Sam turned his head away from Dean for a second. He knew Dean was pissed at him and if he wanted to get out of the panic room he would have to say he was sorry and try his best to explain why he did what he did and hope that his big brother would hopefully understand him and set him free of this jail cell he and Bobby threw him into .

Sam- "Look, I'm sorry. I shouldn't have lied to you, just open the door."

Sam was begging and hopeing that Dean would just open the door and see that everything was fine and that they could get through this. But Sam had this fear in the back of his mind that his big brother, Dean, wouldn't open the door and would never forgive him of this. Sam closed his eyes and opened them when he heard Dean's voice.

Dean- "You don't have to apologize. It's not your fault...."

Sam inhailed sharply, hopeing that what he feared wasn't true and that his brother still cared about him and was going to let him out of the panic room. Sam right now wanted so badly to be out and to clear this thick air that was between him and Dean.

Dean- "It's not your fault that you lied to me, over and over again. I get it now, you couldn't help it."

Rage filled up inside Sammy. He couldn't believe he let himself think for one moment that Dean would actually understand him and believe him, or maybe trust him in what he was doing and would allow him the chance to explain and set things right or to be trusted enough to be let of of the panic room. Sam was mad at Dean but a tad mad at himself for letting himself think Dean could put aside his anger and listen to his little brother.

Sam- "I'm not some junkie!"

Dean- "Really?"

Dean threw this word out there. In his tone of voice Sam could hear that Dean didn't believe a single word he had just said and he could tell from his big brother's eyes that Dean didn't believe or trust him, which hurt and upset Sam.

So, Sam just went for it and threw it all out there, the truth he has been hiding, the reasons behind why.

Sam- "Dean, I'm not drinking the demon blood for kicks! I'm getting strong enough to kill Lilith."

Dean- "Strong?"

Finally Dean couldn't hold in his anger and hate any longer. He began raising his voice at Sam calling he weak and pathetic. He couldn't believe in the words that came out of Sammy's mouth. Dean clearly saw this problem with the demon blood as a drug issue but when Sammy said that it was a means to an end to killing Lilith, cause killing her is what mattered. Dean shocked his head.
"What mattered!? How could Sammy see harming himself by drinking poison to kill a demon what only mattered. Couldn't he see that he was what that mattered and nothing else in the whole world. He was seriously messed up to think that this was the answer and what mattered more than his own well being and family." Dean thought as he looked at his brother, who he couldn't recognize any longer.

Sammy reaching his limit of trying to stay calm and play nicely lost his cool and angerly attacked Dean.

Sam- "Killing her is what matters Dean! She killed you! Are you too self righteous that you forgot about her!?"

Dean exhailed and shocked his head. He gave a small smirk at Sammy.

Dean- "Oh, Lilith's gonna die. Bobby and I will kill her. And not with you."
Dean in a way added that last part to kinda hurt Sammy. Dean was so upset with Sam that he wanted to make his little brother feel some of the pain he was feeling at this moment.

Sam- "You can't be serious?!"

Sammy couldn't believe Dean at what he just said. Dean knew how much he wanted to kill Lilith for what she had done to Dean. Sam wanted to make her pay for a long time and now Dean was taking this away. Keeping him locked up, down here! Sam was growing more mad at Dean but he didn't want to show how angery and upset he was with his big brother.

Dean- "Too bad Sammy. You just bought yourself a bitch warmer seat 'til the apocalypse."
Dean stared at his little brother for one more second before he reached up and closed the lach.

Sam rolled his eyes at Dean when he finished talking. He couldn't believe this was happening. Then he saw Dean closing the small window in the door and he panic for a second.

Sam- "Dean look...No no! Come back here!! Dean!!"
Sam threw his fist against the door.
Sam- "Let me out of here! Dean let me out of here!! DEAN Let Me Out!!!"

Dean was walking away from the panic room and was walking slowly up the stairs as he heard Sam screaming at him. Now that Dean wasn't in front of Sam he exhailed and let his eyes and face be filled with the emotions he was keeping at bay. Dean came to the top of the stairs and closed his eyes. He could hear Sammy, his little brother screaming at him to be free and it broke Dean's heart to hear Sammy so upset and mad at him. Dean opened his eyes, they were becoming watery and he felt like crying but he couldn't. Dean turned to look back down towards where he baby brother was being held at. He heard Sammy bang on the metal door.

Sam- "Dean!!"

Dean closed his eyes and a small tear fell from one of his eyes. He brushed it away very quickly before opening the door and going upstairs to where Bobby was at. Dean pushed the door open and slowly closed it behind him, only hearing Sammy's voice faintly, and it was heart breaking to leave his little brother when he was calling out to him.