Stellar (Meet Me In Outer Space)

All things considered, Dean Winchester's life is pretty swell. He's a flight engineer for NASA, living aboard the International Space Station, and also in his expedition crew is Dr. Castiel Novak, his best friend from college with whom he shared a longtime dream of working in space.

Except, Cas isn't his best friend anymore, and hasn't been since their epic fallout eight years ago. Now it's up to Dean to figure out what exactly went wrong and try to fix it, which would be a lot easier if Cas would actually talk to him, and a lot less complicated if Cas weren't so damn attractive.