When you stick your finger up someone's ass so deep you reach there intestine track, then your finger proceeds to slide and do loop de loops in there intestines
The process of microstructure deformation here atomic bonds break, atoms move, and bonds reform at new positions.
"Y-Yamete stop banging my piece of metal!! I'm so m-malleable you're bending me all over the place!!" The piece of iron screamed in pleasure. His atoms were shoved around like a game of dodgeball, becoming permanently altered as the other piece of metal forced through his atomic bonds. It was a sensual game of slip n slide between sexually active atoms.