holdmesamthatwasbeautiful:

It was endearing at first, John supposes. Dean
throwing his arm possessively around Sam’s shoulders whenever anyone approached
them – wasn’t that what big brothers did?

Years passes however, and Dean’s arm is still
possessive around Sam’s shoulder, but John doesn’t find it cute anymore. 

Sam is sixteen and Dean has hit the blossoming twenties, and John’s stomach turns when he sees the way his boys look
at each other.