Drinking in his father's smell

A dutiful son sniffs deeply at his own father's pits before giving each of them a good lick. Only after he's done that will he want to work his way down his dad's body, front and back, even going as far as licking and slurping on his father's actual shithole before giving his dad's balls a tongue-ing and then, the Holy of Holies, his own father's cock, the very same instrument which created his own body - and he'll suck and suck and keep sucking on it until he receives the gift of tasting the very same hot spunk that led to his own conception. What could be more logical and understandable than that? Such a fine son!