Castiel had run away to his nest after seeing the destruction of Heaven. He had trusted Lucifer, yet his brother had betrayed him. Why hadn't Lucifer just been able to follow his father's instructions? Why must he rebel? Couldn't he see the beauty of humanity and how necessary it was to protect them? Lucifer had destroyed Heaven and injured many of Cas' siblings. Cas was not injured, as he was only a fledgling and didn't fight, but Gabriel had fought at the instruction of Michael and their father. Gabriel had been injured but not as badly as many others as he was an archangel. Although as Gabriel was an archangel, he had grown up with Lucifer and was much closer with him than many other angels who had fought. Balthazar had also fought, although he did so behind Gabriel's back as, like Cas, Balthazar was still a young fledgling with not yet fully developed powers and wings. Because of this, when Gabriel had seen Balthazar fighting, he had spent most of his time and energy trying to protect him. Cas had had no interest in fighting. He didn't want to hurt his siblings. He didn't want to hurt anyone. So he stayed in his nest and covered his ears, trying to forget about the war which was being waged outside.

As Cas sat, wrapped in his tan trench coat and beautiful black and deep blue wings, he heard a commotion. It was the sound of hundreds of angels jeering and cheering. He snuck out of his nest and ran towards the noise, curious about what could make them do that, after so long of hearing nothing but noises of pain. What he saw broke his heart, and made him wish he had stayed in his nest. Lucifer was being made to walk towards the Pit by Michael. Both of his brothers were injured, the result of the two of them fighting each other. The two strongest and closest brothers in Heaven being forced to fight each other took a heavy toll on them. Michael was walking with a limp and had his wing bandaged. Lucifer was covered in cuts and blood, but what really hurt was the look of pain on Lucifer's face and the absolute coldness on Michael's. The mischievous look which Cas had so often seen on Lucifer's face was gone and the caring eyes and smile which was usually on Michael's face had disappeared.

Gabriel was standing off to the side with Balthazar, both injured and looking heartbroken by what was happening. Cas wondered how this could have all happened. He remembered when he was younger and his brothers would look after him and smile. Lucifer would play with Cas and play pranks on other angels, always laughing when Michael scolded him for setting a bad influence to the younger angels. Michael would look after him and made sure nothing bad happened to him. Gabriel, his caretaker, had been teaching him how to fly and comforted him when he was upset or frustrated. They had been a such a happy family.

Cas could not bear to just stand and watch any longer, so he broke away from the ranks of the angels and ran towards Lucifer. Lucifer stopped short upon seeing him and looked shocked. After all, why would he expect any angel to run towards him and stop his walk towards his inevitable punishment? Lucifer turned towards Michael as if asking for permission and Michael curtly nodded, his face betraying no emotion. Lucifer bent down slowly and Cas came barrelling into him, embracing him in a bone-crushing hug. "I'm so sorry Cas," Lucifer said into Cas' hair, "I never wanted this to happen. I never wanted to hurt anyone."

Cas looked up at Lucifer, his bright blue eyes swimming in tears, "Why'd you do it? Why did you have to fight? We were so happy. I was so happy"

Lucifer could not meet Cas' eyes when he said "I just wanted Father to listen to me. I just wanted him to know that I couldn't love the humans more than him." Lucifer slowly looked up only to see the hurt in Cas' eyes, and he cursed at himself for causing so much pain to his brothers and sisters.

He looked around and saw the damage that he had done. He saw Gabriel and Balthazar, the angels he had sworn never to hurt, leaning on each other in pain. He saw his older brother, Michael, looking ahead, the exasperated but still kind and loving look he usually had for Lucifer gone. Lucifer looked back down and saw that Cas' too large heart had been broken for the first time. And it was all his fault. He had had to rebel. He had destroyed Heaven. He hadn't listened to his father. And in doing so, he had destroyed everything. As Michael cleared his throat, a signal that it was time to move on, Lucifer pulled Cas into a hug, and murmured, "I'm so sorry Cas, I never wanted to hurt you. I love you Cas. Don't ever forget that I love you."

With that Cas pulled away and, quickly grabbed a feather from his wing and shoved it into Lucifer's hand, "So you don't forget about me," he said before turning and running off in a blur of tan and black, the crowd of angels swallowing him up, leaving Lucifer numb at the thought that he would never see his youngest brother again.

Lucifer clambered to his feet and numbly walked towards the hole, holding his last, bittersweet reminder of Heaven tight in his hand. As he fell he kept a firm hold on the feather, and he vowed that for the rest of his life he would never let it leave him, that he would never forget about the young brother with the too large heart who had given it to him.

That was the one promise that Lucifer never broke. He would never forget about Castiel for as long as he lived.

Authors Note: Hey everyone, I have posted these chapters before but these are all the longer, updated chapters. I will be editing all the chapters and posting the new versions. While I am busy with school now, I will probably just be updating the chapters I've already edited. Hope you all like it and let me know what you think!