Since time moved differently in Heaven and outside space and time, only a year passed since Castiel returned to Earth. However, this Earth wasn't the Earth he left behind, but a different one. Jack gave Castiel a chance. A chance to start over. Cas, not wanting to give up his chance to be completely human, agreed. He knew he'll see Jack and Heaven again. He knew the concept of time, a few decades was nothing to him.
He woke up shivering. Ugh. Mondays. He hated Mondays. He got up to have a shower. Once he ate his bowl of cornflakes, he went and brushed his teeth. He was out the door a few minutes later.
"Yes sir. The expense reports will be ready soon." He tells his boss. Phew. If he wanted to move up from his current position he needed to work hard.
Six months later, he was eating a sundae at the local ice cream place as he tried to lift his spirits. His promotion, it was unfairly given to the owner's son. Oh well. That position was no better than the one he currently had. He was looking at his phone when he heard someone sitting across from him. Huh? How?
Anael smirked at Castiel's face.
"Long time no see."
"Anael. How? Did you fall?"
"Oh please. I took a deal. Being a boring low class angel for another few eons made me realise I will never achieve my dreams. Jack gave me the same deal he gave you, so I was sent here. Good thing I have my college degree and money in the bank. How long as it been?"
"A year. You?"
"Ten. I look good for a woman my age. Wow. You look good. Your vessel. I'm surprised to see you kept it."
"I kept my vessel for so long it is now a part of me." He looked at Anael, or "Jo" as she called herself. Wow. She looked beautiful. Castiel shyly looked away when she noticed him checking her out. She smirked.
"Like the goods?"
That started their friendship. Castiel and Anael kept in touch, she was now human herself, but blended in human society easily. She helped Castiel with his resume when she saw he'll never get out of his current position and got him an interview at another company. They celebrated by having dinner. To Cas' surprise Anael asked him out for drinks afterwards.
They were cuddling on the couch on their two year anniversary. Anael didn't know, Cas had a ring in his pocket. Castiel was saving for this ring for months. He knew Anael's tastes, she wouldn't wear a "cheap" ring. He searched for months for a suitable ring, none were good enough. Either too cheap, too expensive, too gaudy, or fake. He finally found it.
Anael eyes were huge when Castiel got down on his knee.
"Anael, these last two years were the best thing that ever happen to me. Will you marry me?" He was nervous seeing her reaction.
Anael was staring at the box. The ring was vintage, but exactly her taste. She nodded with a happy smile. She and Castiel were kissing afterwards.
Anael and Cas were getting married in Ireland. Anael, she dreamt about marrying in a castle. They didn't know anyone well enough to invite, so they had a destination wedding. She looked down at her dress and smiled. Once she heard the wedding song, she walked out with her bouquet.