It's when he starts breathing harder the shaft gets really stiff it oozes more precum and it gets even warmer and the pulses of the hot thick creamy load goes right into your mouth and I personally like to keep going and I like rubbing the balls then I'll jerk his slimy shaft and hold my mouth over the tip to swallow most of it then continue sucking it till he's finished and lick it up clean and I can savor the taste and flavors😉