O is for Only One
Dean fiddled with the fake badge in his hands. He had made a new one for Castiel. It had a heavily implied meaning behind it. He wasn't sure what the ex-angel was gonna think of it. If all else failed, he could always blame Sam since it was his idea in the first place.
"You're still sitting here?"
Dean looked up at Sam. He hadn't realized he had returned. A glance at the clock told him that an hour had passed already. He hadn't realized he had been contemplating even giving Castiel the badge that long.
"This was a dumb idea," Dean said, shaking his head. He tossed the badge down onto the table.
"Come on, Dean, it's Cas," Sam said.
Dean looked at the badge again. Sam was right. This was Castiel. Castiel was his everything, his only one. He cared about the angel more than anything. He would do anything for him. He nearly gave his life on several occasions. He knew that Castiel would do the same for him.
"Here's your chance," Sam said, turning and leaving. Dean looked up, shaking his head, but Sam was gone. He heard Castiel in the hallway asking where he was, and his traitor brother gave him away.
Castiel entered the room with a smile. He greeted the other hunter, walking up to him. He placed a quick kiss on his lips. He pulled back, confused when Dean seemed distracted. He arched a brow at the hunter.
"Hey, Cas," Dean said slowly. He swiped the badge from the table. He looked down at it again. He felt Castiel's eyes on him. He held it out to the angel. It was now or never. "Sam and I made some new badges." He said slowly.
"Oh," Castiel said. He opened it to read his new code name. His smile faltered a moment. He looked up at Dean, confused again. "Castiel Winchester?" Castiel said slowly.
"It kind of fits, doesn't it?" Dean asked, biting his lip.
"Yes, but isn't it a sign of-" Castiel started.
"Of marriage?" Dean asked, his hand coming up to the back of his neck as his face heated up. "Kind of."
"Dean, are you?" Castiel asked, looking up at the eldest Winchester. He was trying to read his expression.
Dean dug two small gold rings from his pocket. He held one out to the angel. "It's only the rest of our lives together."
"Then yes," Castiel said, smiling. He took a ring from Dean and slipped it on Dean's finger with a smile. He stepped up to Dean and pressed their lips together in a kiss. "I will be Castiel Winchester."
Dean smiled at that. It really did have a good ring to it. Dean slipped the other ring onto Castiel's hand. Castiel examined the ring with a smile.
"Only for you, Cas," Dean said.
He could never imagine anyone taking the Winchester name. It was too dangerous to have that label on your back. Being a Winchester meant something, but it was not always a good thing. There were many demons and other supernatural creatures that hunted him and Sam down, wanting them both dead. Castiel knew this and could handle himself. Dean had never considered letting Lisa or Cassie take his name. Castiel was the only one on the planet he knew that could carry that name, and then some. He had proved time and time again that he was worthy.