Reunited with her former master at a class reunion. An unmarried woman, Minami Riona, experiences repeated orgasms and multiple ejaculations during anal redevelopment, part of PRED-840.

Riona, a young wife who runs the coffee shop she's always dreamed of with her husband, lives a peaceful life. Invited to a class reunion, she unexpectedly encounters the man who once trained and developed all her erogenous zones. Although married, she thought nothing of it, but her submissive instincts begin to stir when she gets close. Suddenly, deep throat and anal stimulation begin again in front of her classmate. Her anus, never touched in her usual lukewarm sex, is torn open and stretched, leaving her unable to resist. She engages in hardcore anal sex in a restaurant… Ignoring her husband's calls, she receives double penetration, deep throat thrusts, and even accepts being slapped on the buttocks, experiencing multiple orgasms. She repeatedly realizes she is a sex slave, completely succumbing to ecstasy and collapsing…