Harry & Ed
Imagine Dean coming home from a particularly long and difficult hunt. Bruised and tired he walks into his room to find Cas asleep on his bed, sprawled out under the covers. He considers it for a good few minutes before sucking it up and quietly gets under and laying next to Cas, pulling him closer and puts his head on his chest and falls asleep listening to his heartbeat. It's the best night sleep he's ever had. It soon becomes nightly routine and Dean looks forward to it every day.