Cas is in love with Dean while the hunter is unaware. So Gabriel steps in to help Dean realise his feelings for the angel. In a typical Gabriel way. Destiel, Sabriel.

When it struck Castiel, it dropped him out of the sky. He set down the first place he could find. He stood in a field in Switzerland, swaying on his feet and staring down at his body, dazed by what it had just done. mpreg

After escaping from Death's clutches yet again, Cas jumps right into the fight against the Leviathans. Post-7x10. "My name is Castiel, and I am an angel of the Lord. Let me tell you my story. Let me tell you everything." Rated M for language/sexuality/violence.