Fics like To The Ends of The World.

"I am willing to return Castiel to you. But you must prove to me, Dean Winchester, if your love is stronger than the love Orpheus had for Eurydice. The conditions remain the same. Castiel shall follow behind you, every step of the way, but one glance, even a tilt behind, and the angel remains lost in the depths of the Empty forever. However, if you make it to the portal, the two of you together, the angel is yours. Forever." Dean gulps. He sucks in a deep breath. "Deal. But don't you dare back down."

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