Sam would be so tall he actually gets to see slightly above how tall he’d be as a regular guy! If Dean’s shifting around at all, he might end up clinging to that spike of hair Dean’s so proud of, and complaining.
And Dean would let him, because Sam’s earned this and deserves to be tall, dammit.
Fun fact – tiny Sam standing on regular Dean’s head would be just as tall as Jacob when he’s full grown.
Brothers Apart 