This was so lovely, so much conveyed in a short fic, really well written. Of course Cas would want to stay inside with his unconscious humans, although a little bit of him wanted to look at the stars with Hannah too. And I loved this line, summed Dean up so well and made me ache for him as he dons his mask again...

"Dean is a version of himself you recognise again, faded and hiding."

Lovely; sad but lovely.