6am, I still haven't gone to sleep, and I read waaay too many fluffy domestic destiel fics in the last two hours. I wanted one too! Though I may have to warn you... I have no idea what's in here. It's probably so domestic it'll make you throw up puppies or something.
Dean wouldn't admit it to anyone, but he loves cuddling. Even though he never says, it's obvious and almost everyone around him knows. You could see it before, in the way he always used to clutch his pillow close for the night when he was asleep. He wanted the warmth of something, of someone, and if he couldn't have that, a pillow would have to do.
Now it's even more obvious and Sam sometimes thinks it's disgustingly adorable, but he never says anything, he just rolls his eyes and smiles.
Cas loves Dean's cuddly side. He loves how Dean would snuggle closer to him at night when they're in their bed, or how he would sit as close to Cas as possible without actually being in his lap when they're watching a movie, he loves how now he can wrap his arms around Dean and pull him closer and make him feel loved, like he deserves to feel and he loves when Dean holds him and runs his hand through his hair.
Cas loves it when they fall asleep on the couch in each other's arms after having a Doctor Sexy marathon and waking up in the same way as the night before, still unmoved. Their hair is always so much messier and they have morning breath but they still kiss and then Dean makes a face and tells Cas to go brush his teeth and they both try to untangle themselves from each other.
There are nights, usually after hunts-almost-gone-wrong, when they just cuddle in bed and don't say a thing. It's always quiet after one of them almost loses the other, and the silence is only interrupted by soft murmurs about how I can't lose you again, how you mean so much to me, and how I love you so fucking much that it's painful. On nights like those they tell each other stories. Dean tells Cas stories about his childhood, about what life was like before hell and sometimes they're stories about after, but not so much because Cas already knows this part. Cas tells Dean stories about what heaven was like before everything started to go wrong or about humanity and some of its greatest moments. They both whisper before they fall asleep that I'll never leave you.
Some of Cas' favorite nights are when all their friends are over. It's not that much, because their hunters and it's hard. But they're all in the bunker's living room, watching movies and eating junk food. It's Cas and Dean and Sam, and Garth and Charlie, and sometimes Kevin joins them too, and they try to forget about wars and monsters and tablets and hell, and just act like normal people. Those nights usually end up in some romantic comedy and everyone being quiet and Dean and Cas fall asleep on top of each other and when they wake up everyone else has about 20 new pictures of them cuddling in their sleep, and Dean pretends to be mad, but when he leaves Cas asks them to send him the pictures and everyone laughs and nods.
They cuddle after sex, and they're so sleepy and whisper small, sweet nothings into each other's ear and they both fall asleep with a genuine smile on their face, which is now not as rare as it used to be. They make each other happy.
So maybe Dean won't admit that he's a cuddler, but Cas knows he is, and he doesn't mind that one bit, because, well, he loves cuddling just as much as Dean.