Jordan Carver. Her mega tits. Your boner. Do the math.
Here's Jordan who, once again, ably demonstrates this masturbation equation:
http://brunetteslovehotcum.blogspot.com/2012/08/jordan-carver-more-mega-boobs-more-mega.html
http://brunetteslovehotcum.blogspot.com/search/label/Jordan%20Carver