sam being afraid of dean but knowing he has to love him to save him
sam keeping holy water and ruby’s knife on him all the time, even setting them on the shelf when he showers
sam trying to pretend he’s not scared of dean for his own benefit, because dean doesn’t know how to care about that anymore
sam putting a devil’s trap under dean’s bed that dean has to step inside of every night before sam goes to sleep so sam can sleep at all