The wind whips coldly around him as he stands on the edge of the world. Everything in his mind is begging him to jump, to end it all, and to fly one last time, if only for a while. Tears cloud his eyes, as he steps back and thinks of his family. Well, the only real family he'd ever known. Sam with his infectious laugh, Bobby who scolded them but was always there for them no matter what. And Dean, he would miss Dean the most. Castiel would miss the way his eyes crinkle when he smiles, his cologne, his questionable taste in music, he'd miss everything about him.
Shifting his weight from one foot to the other, the once-angel thinks about all that he has lost. The urge to take flight was stronger than ever, everything he loved was taken from him. He was human again, Bobby has been dead for years, Sam got out of the life, and Dean is reigning king of hell. Human emotions were exhausting, has it always been this difficult? Nearing the cliff's edge again, he tightens the tie on his trench coat, takes a deep breath and takes the first step. "What on earth do you think you're doing?!" Dean demands.
Cas freezes instantly, but the tears only come harder now, and they choke out his voice, as he turns to face Dean. "I-I don't know what to do now." He says softly, "I'm human again. But I can't sleep, I had the most awful nightmares, I'm sad all the time. I miss Bobby, and Sam… And You! I miss you a lot. It just all seems so useless.." He is sobbing again as he looks up to meet Dean's eyes.
"Cas, I know things are hard, but this isn't the way to deal with them. Do you have any idea how many times I've thought about this?" Cas looks up at him, eyes swimming with tears. "But you're king of hell, I'm just an ex-angel with no hope." Dean clucks his tongue, "Now why would you say there's no hope?" Pulling the angel into his arms, "Have you ever heard the saying 'It's better to reign in hell then to serve in heaven?'-" Kissing the tears from his face, "Cas. Instead of dying, or being alone, why not come stay with me?" Cas' face scrunches in confusion, "How is that possible? I don't want to go to hell." Dean laughs a genuine laugh, the one he has missed so much, "Well, if you kill yourself, you're headed there. So…" Castiel shoves him away, "You make it sound so easy to just solider on, I've been alive for thousands of years, and it's not that simple!" Breathing hard, "I just.. want to fly one last time," He is sobbing now, "I miss heaven, I miss you, I miss my grace! I DON'T KNOW WHAT TO DO WITHOUT YOU. And you just want me to run off with you, it's not that simple!" Cas closes the space between them in a single stride, he wraps every part of him into every part of Dean, and for a split second, all of his pain melts away. Only his need for oxygen pulls him away, stroking Dean's solemn face, "Goodbye Dean Winchester. I've loved you for as long as I can remember." Castiel kisses his forehead with such sweetness, Dean himself begins to tear. And before he can say a word, there is a trench coat is floating in the breeze, as Castiel takes flight for the very last time.