Is this big ass a slut or a masochist? This is a thoughtfully designed Big Butt series where you can enjoy both the sadistic and masochistic aspects of masked women with huge butts! A test of endurance where a woman with a perverse sexual appetite won't take off her mask until she's satisfied. This time, we have Black Mask, a lady with a muscular butt, whose hips are 88cm but transcend size with their vibrant sphincter muscles. She shows off her vibrant sphincter muscles to the masochistic man, saying, "Look closely at my beloved butt..."