Now imagine looking up from his cock to his face.
Now actually look at his face now - right now - on the bus/train.
Now imagine his hand coming down on your head, pushing your face close to his cock.
What does it look like? Imagine that cock in your head. Is it short/long, fat/thin, cut/uncut.
Does he have big/normal/small balls? See how hard it is?
Lick your lips NOW. Then continue.