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"Calmly, gently knuckle-shuffle his brown-eye."

Even though the dude in question is nothing more than a rubber model's disembodied ass, it's so realistic that the cheeks jiggle when they're touched, like actual skin. Its upturned balls and half-cock rest realistically against its own rubber stomach.

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Again, I stress ... it's purely an instructional video.

It's clearly not an ass, but as you watch the Buttmaster's expert hands and fingers dancing in and out of its rubber anus, it becomes impossible to not imagine a real ass there.

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Your ass.

You're welcome.

I want to give a special thank you to Garbage Haus and Sarswimmer for finding the "Orange Fingering" and "Robotic Vagina" videos respectively. If either of those videos got you fired, those are the people to blame.

Check out more from Cheese in 12 Things You'll Wish You'd Never Seen Under a Microscope. Or check out some more SFW vids that will make you squirm in 5 Ridiculous (Safe For Work) Fetishes.