You know, before discovering this toy, I mostly used my knees to explode balls
*Screw one full turn. Wait 20 sec*
I loved to feel the balls crushed between my knee and the guy. I felt that it was reflected throughout my body. Then a knee is wider than a foot or a fist, right ?
*She screws a full turn. Wait 10 sec*
Of course I love kick and punch too. But I like to see the balls being slowly crushed, to see them turn white, almost to hear them crack.