Sam and Cas making a sex tape and watching it later and discovering that they kiss more than anything else in bed.
Cas getting up early with Sam so that he and Sam can have quiet time together before Dean wakes up, getting coffee and donuts together and holding hands without having to listen to Dean gripe.
Cas hunting with Sam and shielding him from demons and other creatures, remembering how Anna and Lucifer and all of those other angels wanted to hurt or kill Sam, snarling “You will not take him.”
Cas taking pride in the fact that he and Sam have been together long enough that his clothes smell like Sam now.
Sam and Cas taking lots of pictures of each other, Cas making sure that Sam is smiling before he takes it because there’s nothing more beautiful in all creation than Sam happy.
Sam teaching Cas how to drive and to celebrate when Cas gets his license they have sex in the backseat of Cas’s new car.
sam and cas cuddling, cas has his arm around sam’s shoulders, and both of them are wearing blue sweaters with little snowflakes on them, and cas keeps running his fingers through sam’s hair, “it’s soft”, and sam sighs and leans into the touch and they’re both warm and content and sam’s a little flushed and he arches his hips up and cas’ eyes on him are fond
sam and cas cuddled up on a couch in the bunker, cas pressed up to sam’s side wearing a dumb christmas sweater with a reindeer on it, and sam’s arm around cas’ shoulders, and they’re warm and cozy and there’s a jazzy christmas record playing on the record player ;u;