Sam didn't like to let the baby out of his sight, much. He was too tiny, too precious and helpless. He was rarely put down, but that was partially due to the abundance of eager arms in their house, who all wanted to hold Aidan and marvel over how adorable he was.
Sam knew his son would do great things. He just knew it, but right now it was only this tiny person holding him together. In a way he never anticipated, he finally understood his own father.
Right now though, Aidan was in the crib that he and Anne had picked out, with the CD player quietly pushing out Led Zeppelin lullabies- a present from Dean, with the promise they'd get them back for when Robbie was born. He was just going to check on him, one more time before maybe taking a shower. He opened the door carefully, just intending to peek.
There was a shadow hovering over the crib! Sam's pulse pounded in his ears as he screamed for Dean and grabbed the holy water flask on the changing table and flung the contents at the shadow figure before diving towards the crib to protect his infant son.