A new era of bad girl is born, who enjoys digging into her boyfriend's anus in front of her girlfriend, developing "male orgasm & tokoroten"! She brings along her fellow girls and chokes and restrains the man! While he is unable to resist, she gradually teases and expands his asshole. The man learns for the first time the pleasure of the prostate. A "female orgasm" that feels good even without ejaculation. The man loses his sense of resistance as he feels pleasure forever, and she continues to piston his penis into him!