Space, The Final Why-Are-We-Out-Here?

Tumblr Prompt, "Kiss Me You Idiot -Castiel" AU. Dean has a deep dark secret... involving a certain five-year mission to explore strange new worlds; a certain Trickster Archangel is very much aware of this. Thus, his current conundrum... floating in space, seething with rage... And that's when things take a turn for the WORSE...