That Funny Feeling [Castiel Love Story]

He's an angel of the lord in a dirty trenchcoat. A holy tax accountant. He raised a legendary hunter from perdition and helped him and his brother in their adventures. When Castiel sends the boys on a hunt to protect another demonic seal from breaking, he runs into something unexpected. A funny feeling he's never experienced before. Every time he sees her, he gets the weird feeling again. Is it just his vessel, or is there something more?