When the male takes a whip while letting the female suck his dick, to add on vibration the girl starts singing so her mouth and tongue vibrates around the whole dick seemingly creating a vacuum of unholy vibrating pleasure, if the female stops singing the whip is used as a second method to make the female scream to which vibrates the throat which the males dick should be in.
Guy:"hey girl wanna do a dong a long sing a song?"
Girl:"sure baby im gonna fill u up with some justin beiber"
Guy:"you better not stop or i will whip you"
Girl:"mmmm kinky"