The challenge word is punish and Sam's worried what people will think if they see him!
In their hunting career, they had experienced more than their fair share of physical punishment but nothing had offered the exquisite torment that currently distracted the elder man.
"Please, Sam!"
Dean's nails raked unconsciously against the plaster of the long-leg cast, searching to ease the itching that threatened to drive him insane.
The younger Winchester knelt at his brother's feet, a look of severe discomfort on his face.
"If you ever tell anyone..."
Dean shook his head pleadingly as Sam conceded and leaned in toward his brother's desperately wiggling toes, blowing cool, soothing air down the constricting cast.
"Ahhh!"
Silly I know!