This is easy to understand, so I want you to watch it close up... Before talking about the hole being tight or the sphincter, when it feels good, the worm-like ceiling inside this hole, the mimi‘s ceiling, comes out so much it almost turns inside out, crushing the cock and pushing it back! The soft, squishy pussy turns into an unbelievable masterpiece in the second half with incredibly fine folds stimulating and squeezing...🤦♀️