On the tenth day of Christmas...
Christmas Morning (Sam/Dean)
Sam can't remember ever having a normal Christmas morning. He's seen enough Christmas movies to know what it's supposed to be like; the children are all gathered around the tree to see what Santa brought them while the parents look on lovingly. Dad used to tell him that once they did have that but Sam was just a newborn.
Sam mostly remembers waking up on Christmas and having to clean Dad's guns. Or go restock their supply of rock salt. Mostly, he remembers the waiting though. Dad was usually gone by the time he woke up and Dean would be around for half the day. So Sam would wait, wait for someone to walk in the door, wait for his Dad and brother to be back from another hunt. Wait for a normal Christmas.
Soon though, Sam grew up. He still wished for a normal Christmas, but really, it was just another day out of the year. He lost his belief in the magic of Christmas, he stopped waiting. Instead, he joined Dad on the hunts. While other kids woke up to open presents, Sam woke up to a gun and a date with a nasty demon. And maybe, that was normal for them and Sam could live with that.
But now Dad is gone forever and Dean was too for a while there. Sam couldn't wait anymore. Dean came back and Sam felt guilty for not waiting. Guilty for trying to move on. Dean says he understands but that doesn't take most of the guilt away. Sam wonders if Dean would have waited for him. He wonders, but he doesn't ask Dean. So their lives go on, with as much normalcy as two brothers who hunt demons can have.
Sam awakes one morning and can feel that something is amiss. He sits up and reaches for his gun, pointing it at the door. Only, it's not his gun, it's a candy cane. And he realizes, in this shitty little motel room, that there is a tree. Not just any tree, but a Christmas tree. And Sam's eyes go wide when Dean walks in the door, a Santa hat on his head and a sack on his back.
"Merry Christmas, Sammy," Dean tells him, handing him a present. And for one beautiful day, Sam doesn't feel any guilt. Not even when Dean leans over to press a kiss to his forehead and Sam pulls on Dean's collar so their lips connect instead. They spend the rest of the day opening presents, reminiscing about old Christmases, and drinking heavy eggnog. They spend the night in each others arms, exchanging a different kind of present.
Sam is glad he waited for a normal Christmas, spent with the ones he loves, his family, his brother, his Dean. And now, he looks forward to Christmas every year, since it's the one day he feels free, all his burdens lifted, all the guilt washed away.