I don't have much to offer except this breif comment: the stud on the bottom has A LOT to do with the effect. The tits have to be of the right quality, too, but they're not going to do much without him.
Here is some AMPLE evidence to support this nomination, what a goddess, long live Tyra Moore!
1)
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2)
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3)
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4)
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5)
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Enjoy! :boobies: Wily