GOOD LUCK TAKING YOUR EYES OFF OF THIS ...

TMZ has obtained the UNBELIEVABLE photos of Octomom whipping a grown-ass man dressed up as a baby in some kind of weird FETISH shoot.

Octo -- who STUFFED herself into an ultra-skin-tight corset -- is crackin' the whip on a guy named Tattoo ... an L.A. radio personality featured on Rick.com.

The eerily-erotic madness takes place all over Octo's La Habra home ... with Tattoo posing with her kids' horsey and inside their play castle.