A super close-up of Kokone Mizutani's stylish anus! To prove that a woman's anus twitches when she feels pleasure, she stimulates her sensitive parts with an embarrassing spread-eagle pose that exposes both holes! Then, the wrinkles of her anus begin to contract and creak! When she starts to feel pleasure from the pistoning of a cock, her entire anus starts to move, and when she is creampied, semen drips into her anus that can't stop twitching. The twitching of the anus is truly a barometer of ecstasy!